Answer:
The correct answer will be option-a synergist
Explanation:
In the musculoskeletal system, the muscles to produce a movement work in group or pairs like hamstrings and quadriceps or biceps or triceps. The muscles which work is known as an agonist or prime mover.
The muscle which helps prime mover by moving in the same direction and at the same time is known as synergists. The synergists produce a similar motion as the prime mover and also stabilizes the joints which hold the position for smooth movement of agonist.
Thus, synergist is the correct answer.
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