Correct option is C
Given:

Logic: Inner square given two numbers are multiplied and then square of that number.
Explanation:
3×2 = 6, 6×6 = 36
6×2 = 12, 12×12 = 144
3×5 = 15, 15×15 = 225
Similarly,
4×4 = 16, 16×16 = 256
So, ? is replaced by 4.
Thus, Option C is the correct answer.






