Correct option is D
Given:

Logic: Sum of Square of numbers (Inside square) = Number (Inside Circle)
In 1st Figure:
(2)2 + (3)2 + (4)2 = 29
4 + 9 + 16 = 29
29 = 29
In 2nd Figure:
(1)2 + (8)2 + (2)2 = 69
1 + 64 + 4 = 69
69 = 69
Similarly In 3rd figure:
(7)2 + (2)2 + (5)2 = ?
49 + 4 + 25 = ?
? = 78
Therefore, the missing number is 78.
Thus, the correct option is (d)






