The correct option is D 9
9, 17, 33, 65, 129
Difference between each number is as follows,
8 16 32 64
2 X 2 X 2 = 8
2 X 2 X 2 X 2 =16
2 X 2 X 2 X 2 X 2 =32
2 X 2 X 2 X 2 X 2 X 2=64
In this number series each successive number is sum of previous number and square of 2.