Contracting biceps and Relaxing triceps. Thus, option "B" is correct.
How are muscles control the elbow?
Muscles controlling the elbow. The muscles which control the movement of the elbow, are the triceps and the biceps.
The bicep contracts or shortens, pulling the lower arm up, and causing the elbow to bend. At this time the tricep relaxes or lengthens.
Thus, option "B" is correct.
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