Which was the first part of India to hold an election based on universal adult franchise?

Manipur

The correct answer is Option 3 - Manipur

The first part of India to hold an election based on universal adult franchise was Manipur.

Manipur held elections in June 1948 under pressure from public opinion. These elections were based on universal adult franchise, making Manipur the first region to do so.
All-India wide elections based on universal adult franchise were later held for the first time in 1951-52.