Which prominent leader of Congress (O) announced that he would go on an indefinite fast if assembly elections were not held in Gujrat in 1975?

Morarji Desai

The correct answer is option (3) - Morarji Desai

Morarji Desai, a prominent leader of Congress (O), who was the main rival of Indira Gandhi when he was in the Congress, announced that he would go on an indefinite fast if fresh elections were not held in the State. Under intense pressure from students, supported by the opposition political parties, assembly elections were held in Gujarat in June 1975. The Congress was defeated in this election.