Correct Answer: (a) 4, 2, 1, 3
Solution:The Shimla Agreement on 2 July, 1972 was signed between India and Pakistan. Indo-Soviet Treaty is a pact for friendship and cooperation between India and the Soviet Union on signed on August 9, 1971. The Farakka Accord between India and Bangladesh was signed in 1975 temporarily and finally on 12-December, 1996 and Tashkent Agreement with Pakistan was signed on 10th January, 1966. Therefore, chronologically option (a) is correct.