Correct option is A
Given:

Logic: Sum of Square of Number inside square = Number inside Circle
In 1st Figure:
(4)2+ (5)2= 16 + 25 = 41
In 2st Figure:
(6)2+ (7)2= 36 + 49 = 85
In 3rd Figure:
(8)2+ (9)2= 64 + 81 = 145
Therefore, the missing number is 145.
Thus, the correct option is (a) 45






