Correct option is C
Observing the sequence:
69, 70, 74, 83, ?, 124
The differences between the numbers:
70 - 69 = 1
74 – 70 = 4
83 - 74 = 9
The differences form squares of 1, 2, 3, ….
Thus, the next difference should be .
=> 83 + 16 = 99