Step 1: Amendment Chronology.
- 1961 Amendment: Dadra and Nagar Haveli incorporated as a Union Territory.
- 26th Amendment (1971): Privy Purse abolished.
- 39th Amendment (1975): Election Tribunals abolished.
- 61st Amendment (1988): Voting age reduced from 21 to 18 years.
Step 2: Correct Order.
The chronological sequence is:
(A) A: Dadra and Nagar Haveli Incorporation (1961)
(B) C: Privy Purse Abolition (1971)
(C) B: Election Tribunals Abolition (1975)
(D) D: Voting Age Reduction (1988)
Step 3: Answer.
Therefore, the correct order is (B) A, C, B, D.