Correct option is B
Given: 9 , 10 , 18 , 45 , 109 , ?
Logic: Difference of two constitutive number is increasing from 1, 8, 27, 64, 125
(which is cube of respective numbers 1, 2, 3, 4, 5)
Explanation:
10-9=1
18-10=8
45-18=27
109-45=64
Similarly,
?-109=125
?=125+109
?=234
Thus, Option B is the correct answer.