The correct answer is option 2, Ramsay MacDonald. Ramsay MacDonald was the British Prime Minister who prescribed the separate electorates for India based on the Communal Award in August 1932. The Communal Award was a political decision made by the British government to grant separate electorates to different religious communities in India, particularly Hindus, Muslims, Sikhs, and Christians. This decision was influenced by the demands of various communities for separate representation to protect their interests. Separate electorates meant that each community would elect their own representatives, ensuring that their specific needs and concerns were addressed.

It is important to note that the Communal Award was a part of the larger political debate on the future of India and its constitutional framework. The idea of separate electorates was met with both support and criticism. Supporters argued that it would give minorities a stronger voice and protect their rights, while critics believed that it would further divide communities and hinder national unity.

Overall, Ramsay MacDonald played a significant role in implementing the concept of separate electorates through the Communal Award in India in 1932.