Correct option is A
Given:

Logic: Top two number ÷ 9 = Bottom number
For 2nd pair;

14 + 84 = 126,
= 14
For 3rd pair;

21 + 42 = 63,
Same logic apply on 1st pair;

? + 54 = 81
? = 81 - 54
? = 27
So, 27 is missing number in figure.
Thus, the correct answer is (a).





