Question for Jehovah's Witnesses: Evidence?

The Governing Body of Jehovah's Witnesses, who represent the disparate group referred to as "the faithful and discreet slave", state that they alone speak for God on earth. They claim that the organisation they use to publish their doctrines, the Watch Tower Bible and Tract Society, Incorporated, a US-based publishing corporation, was chosen by Jesus Christ himself, in or around 1919, to represent God's Kingdom's interests here on earth, and to supply Christians with the only God-approved literature and teaching on the planet.

My question for Jehovah's Witnesses is this; in light of the extraordinary claim cited above, where is the extraordinary evidence?

Updated to address StandFirm's accusation;

StandFirm said...

Strawman. Please prove your point by quoting from our publications.

Which part of my statement is the strawman?

- 1919

- chosen by Jesus

- only God-approved literature

I'll have a go at establishing each claim via your publications and then I'll re-ask the question;

"The historical facts show that 1919 was the year when the remnant on earth of the 144,000 Kingdom heirs began to be freed from Great Babylon. In that year the message of God's established kingdom began to be preached from house to house and publicly by Jehovah's Christian witnesses in a fearless way. This preaching of the Kingdom as established in 1914 was in fulfillment of Jesus' prophecy in Matthew 24:14: 'This good news of the kingdom will be preached in all the inhabited earth for a witness to all the nations." (Babylon the Great Has Fallen!, 1963, p. 515.) [emphasis added]

"TIME OF INSPECTION BY THE SLAVE'S MASTER

Without a question of doubt, it was a real time for inspection of the Master's "slave" class. All the facts of the case argue that the Master came for the work of inspection at the time. Such a thing was to be expected according to the prophecy of Malachi 3:1-5. Of course, the sectarian churches of Christendom had made a wartime record for themselves, an open record that had a heavy bearing on their claim to be disciples and slaves of Jesus Christ. Could they, by even their latest record down till 1919, prove that they themselves were the composite "faithful and discreet slave" class of the heavenly Lord and Master, Jesus Christ? He as Judge would indicate what his findings were by the way he thereafter dealt with the hundreds of religious sects of Christendom." (God's Kingdom of a Thousand Years Has Approached, 1973, p. 349.)[emphasis added]

"There would, however, be a further application of Joel 2:28-32. Indeed, this prophecy has had remarkable fulfillment since September 1919. At that time a memorable convention of Jehovah's people was held in Cedar Point, Ohio, U.S.A. God's spirit was clearly manifest, and his anointed servants were stimulated to embark on the global witnessing campaign that extends into the present day." (Watchtower, May 1, 1992, p. 13.)[emphasis added]

"Particularly in 1919 and 1922 were there modern outpourings of Jehovah's spirit, especially in connection with the two conventions of Jehovah's dedicated people at Cedar Point, Ohio." (Watchtower, June 1, 1981, p. 30.)[emphasis added]

"But Jehovah raised them up by his spirit and word of truth. Shortly thereafter, at their 1922 convention in Cedar Point, Ohio, they loyally determined to advertise the King and Kingdom. Jehovah has been guiding them since then, so that his name and kingdom have become known worldwide." (Watchtower, December 15, 1980, p. 19.) [emphasis added]

"Since Jehovah God and Jesus Christ completely trust the faithful and discreet slave, should we not do the same?" Watchtower 2009 Feb 15 p.27 [emphasis added]

In case there is any doubt that the Governing Body speaks on behalf of the "faithful and discreet slave";

"Similarly, today a limited number of anointed men have the responsibility of representing the slave class. They make up the Governing Body of Jehovah's Witnesses." Watchtower June 15 2009 Page 24 [emphasis added]

And in case there's any doubt that the Governing Body using the Watch Tower Society to publish "spiritual food" on behalf of the "faithful and discreet slave" class;

"When the time comes to clarify a spiritual matter in our day, holy spirit helps responsible representatives of “the faithful and discreet slave” at world headquarters to discern deep truths that were not previously understood. (Matt. 24:45; 1 Cor. 2:13) The Governing Body as a whole considers adjusted explanations. (Acts 15:6) What they learn, they publish for the benefit of all." Watchtower 2010 July 15 pp.22,23 [emphasis added]

My question for Jehovah's Witnesses is this; in light of the extraordinary claim[s] cited above, where is the extraordinary evidence?