Correct option is B
Given:

Logic: Difference between upper square number and upper circle number is same as lower.
Figure I:
18 - 8 = 10
17 - 7 = 10
Figure II:
22 - 15 = 7
14 - 7 = 7
Similarly in Figure III:
18 - 14 = 4
? - 13 = 4
? = 13 + 4
? = 17
Thus, correct option is (b).






