The system of communal electorate in India refers to the practice of electing representatives based on religious or communal identities. The correct answer to the question is option 2, Minto-Morley reforms of 1909. These reforms, introduced by Lord Minto and John Morley, were a significant step towards representative governance in India. They aimed to increase Indian participation in the legislative process. The reforms introduced separate electorates for religious communities, allowing them to vote for candidates of their own religious group. This was done to address the concerns of different religious communities and ensure their representation in the legislative bodies. The communal electorate system remained in place until it was replaced by the system of joint electorates through the Montagu-Chelmsford reforms of 1919.