In which year was the Shimla Agreement between India and Pakistan signed?

1972

The correct answer is Option (3) → 1972

"After months of diplomatic tension and military build-up, a full-scale war between India and Pakistan broke out in December 1971. Pakistani aircrafts attacked Punjab and Rajasthan, while the army moved on the Jammu and Kashmir front. India retaliated with an attack involving the air force, navy and the army on both the Western and the Eastern front. Welcomed and supported by the local population, the Indian army made rapid progress in East Pakistan. Within ten days the Indian army had surrounded Dhaka from three sides and the Pakistani army of about 90,000 had to surrender. With Bangladesh as a free country, India declared a unilateral ceasefire. Later, the signing of the Shimla Agreement between Indira Gandhi and Zulfikar Ali Bhutto on 3 July 1972 formalised the return of peace. "