The correct option is A Sardar Patel
The key factors that led the states to accept integration into India were, however, the efforts of Lord Mountbatten, Sardar Vallabhbhai Patel and V. P. Menon. The latter two were respectively the political and administrative heads of the States Department, which was in charge of relations with the princely states. Hence, Option A is correct. Jawaharlal Nehru was the first Prime Minister of India, Mahatma Gandhi was the father of the Nation, and Dr. Rajendra Prasad was the first first president. Hence, these are incorrect options.