'The Lucknow Pact' was an understanding between the Indian national Congress and the Muslim League on:-

Separate Electorates for Muslims

The correct answer is Option (2) → Separate Electorates for Muslims

The Lucknow Pact of December 1916 was an understanding between the Congress and the Muslim League (controlled by the UP-based “Young Party”) whereby the Congress accepted separate electorates. The pact provided a joint political platform for the Moderates, Extremists and the Muslim League