D.
E.
paki sagot Po ty

Answer:
D. a man walking on the hallway
—its force exerted by the man walking on the hallway
—the force exerted by the hallway when the man walking
E.a boy holding a ball
— the force exerted by the hand on the ball.
—the force exerted by the ball on the hand.
Explanation:
hope it's help (>/-/<)