Who was the biographer of A.O. Hume and who later became the President of Indian National Congress?

The correct answer is (c) Subramania Iyer.

Subramania Iyer was a Tamil Indian lawyer, journalist, and politician who served as the President of the Indian National Congress in 1894. He was also the biographer of A.O. Hume, who is considered to be the founder of the Indian National Congress.

H.S. Olcott was an American theosophist and occultist who was a close associate of A.O. Hume. He was not the biographer of Hume.

A.C. Banerjee was an Indian lawyer and politician who served as the President of the Indian National Congress in 1902. He was not the biographer of Hume.

William Wedderburn was a Scottish politician who served as the President of the Indian National Congress in 1889. He was not the biographer of Hume.