According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means that if the player exerts a force of 5 N on the soccer ball, the soccer ball will exert an equal force of 5 N back on the player's foot.
The direction of the force exerted by the ball will be opposite to the direction in which the player kicked the ball. Since the player kicked the ball forward, the force that the ball exerts on the player's foot will be directed backward.
Therefore, the correct response is:
5 N backward