Which of the following is true? a. Earth exerts a force due to gravity on your body, and your body exerts a smaller force on the Earth, because your mass is smaller than the mass of the Earth.  b. The Moon orbits the Earth because the Earth exerts a force on the Moon and the Moon exerts a force equal in magnitude and direction on the Earth.  c. A rocket taking off exerts a force on the Earth equal to the force the Earth exerts on the rocket.  d. An airplane cruising at a constant speed is not affected by gravity.

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