Correct option is B
The given series is: 1, 8, 27, 64, 125, ?
Each term in the series represents the cube of consecutive natural numbers:
13 = 1
23 = 8
33 = 27
43 = 64
53 = `125
Following this pattern, the next term should be
63 = 216
The number that replaces the question mark is 216.
Correct option: (b) 216