Explanation:

During 1931, the Kisan Sabha Movement in the Gaya district of Bihar was led by Yadunandan Sharma. He played a pivotal role in organizing the peasants to fight against the oppressive practices of the landlords and advocated for reforms to improve the conditions of the rural agrarian community.

- Option 1: Yadunandan Sharma - Correct choice as the leader of the Kisan Sabha Movement in Gaya during 1931. Correct Answer

- Option 2: Sahajanand - A notable leader in the broader context of peasant movements but not principally leading in Gaya at that time.

- Option 3: Sheetla Sahai - Not prominently associated with this movement.

- Option 4: Tilka Manjhi - Known for leading earlier tribal uprisings, not related to this specific movement in 1931.