Q 3032791632.     A student was asked to find the average of the following `12` numbers :`3, 11, 7, 9 , 15, 13, 8, 19, 17, 21, 14` and ` x`. He found the average to be $ $ $ 1 2 $ $ . What should come in place of `x`?

A

`3`

B

`7`

C

`17`

D

`31`

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