The correct answer is C. G. D. Birla.
A. M. R. Jayakar was a lawyer and politician who served as a member of the Indian National Congress and the Viceroy’s Executive Council. He was a close associate of Mahatma Gandhi, but he was not a cotton merchant or banker.
B. V. S. Sastri was a diplomat and politician who served as the Indian ambassador to the United States and the United Kingdom. He was a close associate of Mahatma Gandhi, but he was not a cotton merchant or banker.
C. G. D. Birla was a businessman and philanthropist who was one of the richest men in India. He was a close associate of Mahatma Gandhi, and he was a cotton merchant and banker.
D. Jamanlal Bajaj was a businessman and politician who served as the president of the Indian National Congress. He was a close associate of Mahatma Gandhi, but he was not a cotton merchant or banker.