Aswimmer uses her feet to push off the wall and the wall exerts the same force back on her. the force exerted by the wall on the swimmer is called a. action force b. friction c. gravity d. reaction force

Option d

Explanation:

According to Newton's third law, for every force "P" that is applied on an object there is a force -P that has the same maginitud that "P" and opposite direction.

In other words "for every action there is an  equal and opposite reaction"

For example, if Object D applies a force "P" on an object B, then object B will make a force -P on object D.

This force is called the reaction force.

Therefore when the swimmer pushes the wall, then the wall pushes the swimmer with a force of the same magnitude that is called the reaction force.

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

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