In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives :

Options

A. 20
B. 21
C. 22
D. 24

Answer

C

Explanation

In each row add the second number to the product of the first and the third numbers to get the fourth number.
First Row
`3xx4+6=18`
Second Row
`2xx8+5=21`
Third Row
`3xx7+1=22`