When a person jumps straight up from the ground, they push downward on Earth. Which of the following best explains why Earth’s resulting motion is not noticeable?
(a) The downward force on Earth is much smaller than the upward force on the person, so Earth barely moves.
(b) Gravity immediately balances the upward force on Earth, preventing it from accelerating at all.
(c) Earth’s mass is so large that the acceleration produced by the interaction force is extremely small, making any displacement imperceptible.
(d) The push lasts for too brief an instant for Earth to gain any significant speed, so its motion is unnoticeable.