Final answer:
The single resultant of the multiple forces occurring over the entire plantar surface of the foot is the a. Ground Reaction Force. This force refers to the force exerted by the ground on the foot in response to the weight and motion of the body.
Step-by-step explanation:
The single resultant of the multiple forces occurring over the entire plantar surface of the foot is the Ground Reaction Force (A).
The ground reaction force refers to the force exerted by the ground on the foot in response to the weight and motion of the body. It is the force that allows us to walk, run, jump, and perform other activities that involve contact with the ground.
For example, when we take a step while walking, our foot pushes against the ground, and the ground pushes back with an equal and opposite force. This ground reaction force helps propel us forward.