Both the biceps and triceps contract. Both the biceps and the triceps relax. The triceps contract and the biceps relax. The biceps contract and the triceps relax.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which statement describes how muscles work to allow a person to extend an arm from a curled position by straightening the elbow?
Possibilities:
- Both the biceps and triceps contract.
- Both the biceps and the triceps relax.
- The triceps contract and the biceps relax.
- The biceps contract and the triceps relax.

The triceps contract and the biceps relax.