Correct option is D
Given: 2, 9, 37, 149, ?, 2389
Logic: The series increases by multiple of 4 and +1 each time:
2 × 4 + 1 = 8 +1 = 9
9 × 4 + 1 = 36 + 1 = 37
37 × 4 + 1 = 148 + 1 = 149
149 × 4 + 1 = 596 + 1 =
597
597 × 4 + 1 = 2388 + 1 = 2389
Correct answer is (d) 597.