Step 1: Understanding the Chronology of Amendments.
- The First Schedule was amended first to transfer territories following the Indo-Pakistan agreements (B).
- Schedule IX was added in 1951 under the First Amendment (A).
- The Preamble of the Constitution was amended in 1976 to include the words "Socialist" and "Secular" (D).
- Mizoram was made a State in 1987 (C).
Step 2: Chronological Order.
The correct chronological order is:
(A) B: First Schedule amended to transfer territories.
(B) A: Added Schedule IX.
(C) D: Amended the Preamble.
(D) C: Mizoram made a State.
Step 3: Conclusion.
Thus, the correct answer is (B) A, B, D, C.