The correct answer is option 1: "In February 1947, British Prime Minister Attlee announced that the British were not going to transfer power to Indians, come what may." This statement is not correct.

Explanation of each option:

Option 1: In February 1947, British Prime Minister Attlee announced that the British were not going to transfer power to Indians, come what may.

This statement is incorrect. In fact, in February 1947, Attlee announced the decision to grant independence to India.

Option 2: Lord Wavell advocated total withdrawal of the British from India by 31 March 1948.

This statement is correct. Lord Wavell, who served as Viceroy of India from 1943 to 1947, did advocate for the total withdrawal of British forces from India by March 1948.

Option 3: It was Lord Mountbatten who speeded up the process of transfer of power.

This statement is correct. Lord Mountbatten, who replaced Lord Wavell as Viceroy in 1947, played a significant role in speeding up the transfer of power and overseeing the partition of India.

Option 4: The Plan Balkan was abandoned on account of Nehru`s opposition to it