Find the missing number?

A. 9

B. 4

C. 31

D. 16

Answer: Option B

Solution(By Examveda Team)

In each shape, use the left and right hand numbers as a source. The upper central number equals the sum of the left and right hand numbers, the middle central number equals the product of the left and right hand numbers, and the lower central number equals the difference between the left and right hand numbers.