Correct option is A
Set I - (4, 12, 8) → 4 + 8 = 12
Set II - (2, 7, 5) → 2 + 5 = 7
Logic: 1st + 3rd = 2nd Number.
From the given option-
(a) 1, 4, 3 → 1 + 3 = 4 = 4
(b) 9, 4, 7 → 9 + 7 = 16 ≠ 4
(c) 3, 6, 5 → 3 + 5 = 8 ≠ 6
(d) 7, 2, 1 → 7 + 1 = 8 ≠ 2
Thus, the correct answer is (a) 1, 4, 3.