To answer this question, you need to know about the history of British rule in India.
The correct answer is B) Robert Clive.
Option A) Warren Hastings - This option is incorrect. Warren Hastings served as the first Governor-General of Bengal, not the first Viceroy.
Option B) Robert Clive - This option is correct. Robert Clive was appointed as the first Governor of Bengal and later became the first Viceroy of Bengal in 1773.
Option C) Curzon - This option is incorrect. Lord Curzon served as the Viceroy of India, not the Viceroy of Bengal.
Option D) Buffet - This option is incorrect. There is no historical figure named Buffet who served as the first Viceroy of Bengal.
Therefore, the correct answer is B) Robert Clive. He was the first Viceroy of Bengal.