The correct chronological order of Paramveer Chakra awardees is:
- (B) Maj. Somnath Sharma (1947)
- (C) Maj. Dhan Singh Thapa (1962)
- (A) Capt. Vikram Batra (1999)
- (D) Flying Officer Nirmaljit Singh Sekhon (1971)
Thus, the correct answer is (B), (C), (A), (D).