Help pls When throwing a ball, why does the triceps muscle contract?

A. The contraction of the triceps muscle causes the arm to flex.

B. The contraction of the triceps muscle causes the arm to extend.

C. When added to the force of the biceps contracting, it provides extra force to the ball.

D. The triceps muscle needs to contract in order to keep the muscle from relaxing.

I think it's A. The contraction of the triceps muscle causes the arm to flex.

Explanation:

The contraction of the triceps muscle causes the arm to flex. The contraction of the triceps muscle causes the arm to extend. When added to the force of the biceps contracting it provides the extra force to the ball.

this is a good question! i'll do some research and come back when i have the answer!