A muscle that assists the muscle that is primarily responsible for a given action is a synergist.
Synergist muscles are those in the body that support or are in charge of supporting the same group of joints during movement. They frequently act as the agonist. This muscle aids in producing movement or motion near a mobile joint.
Biceps brachii, a synergist muscle, aids in forearm flexion activities as an example. A fixator at the muscle's origin can also be a synergist.
Option A is the proper response, so.
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