Because he threw 8 darts at the dartboard => The score must be even. (Odd + Odd = Even)

The most score that he could throw is: \(8.9=72\left(points\right)\)

The least score that he can throw is: \(8.3=24\left(points\right)\)

Satisfy all this operation, only \(C.42\) could be his score.

So the answer is C

Because he threw 8 darts at the dartboard => The score must be even. (Odd + Odd = Even)

The most score that he could throw is: 8.9=72(points)

The least score that he can throw is: 8.3=24(points)

Satisfy all this operation, only C.42

 could be his score.

So the answer is C