The correct answer is option 3, C. Rajagopalachari. The last Governor-General of India was not Sir Cripps, as mentioned in option 1. This option is incorrect. Sir Cripps, also known as Sir Stafford Cripps, was a British politician who was sent to India in 1942 as a representative of the British government. Option 2, Lord Mountbatten, is also incorrect. Lord Mountbatten served as the last Viceroy of India, but he was not the last Governor-General. Option 4, Sir Attlee, is incorrect as well. Sir Attlee, also known as Clement Attlee, was the Prime Minister of the United Kingdom during the Indian independence movement, but he was not the last Governor-General. Therefore, the correct answer is option 3, C. Rajagopalachari. He served as the last Governor-General of India from 1948 until 1950, when the position was abolished and India became a republic.