Correct option is C
In this question following logic is followed-
(2nd)2 × 2 = 1st Number
Option (a) 128 : 8 → 82 × 2 = 64 × 2 = 128
Option (b) 288 : 12 → 122 × 2 = 144 × 2 = 288
Option (c) 350 : 15 → 152 × 2 = 225 × 2 = 450 ≠ 350
Option (d) 18 : 3 → 32 × 2 = 9 × 2 = 18
Therefore, the correct answer is (c).