Find the missing number?

A. 1

B. 4

C. 5

D. 7

Answer: Option B

Solution(By Examveda Team)

Center of the Triangle = (Sum of the vertices )/2

1st Triangle
4 = (4 +3 +1)/2

2nd Triangle
10 = (7 +7 +6)/2

So,
6 = (5 + 3 +x)/2
Or, 12 = 8 +x
x = 4.