Correct option is C
In this question following logic is followed-
1st × 2nd × 2 = 3rd Number
9, 18, 324 → 9 × 18 × 2 = 324
14, 11, 308 → 14 × 11 × 2 = 308
Similarly,
7, 12, 168 → 7 × 12 × 2 = 168
Therefore, the correct answer is (c).