Correct option is D
Given:
GSTA → 51
XMBJ → 53
YDOM → ?
Logic: - Add the place values of all letters in the word, then add 4 (for 4 letters) to get the code.

GSTA → 7 + 19 + 20 + 1 = 47
→ 47 + 4 = 51 Matches given code
XMBJ → 24 + 13 + 2 + 10 = 49
→ 49 + 4 = 53 Matches given code
YDOM → 25 + 4 + 15 + 13 = 57
→ 57 + 4 = 61 Matches logic
Final Answer: 61
Final Correct Option: (D)