Find the missing number?

A. 9

B. 7

C. 4

D. 1

Answer: Option C

Solution(By Examveda Team)

Reading each pair of numbers as 2 digit values, the sum of the 4 numbers is given in the top space in the diagram. I.e
156 = 26 + 31 + 45 + x
x = 54.
So, missing number = 4.