Until test gravity

Why would a heavier book feel lighter on the Moon compared to Earth?
Because the Moon is smaller than Earth

Because the Moon has less gravity than Earth
Because there is no atmosphere on the Moon
Because the book loses mass on the Moon

Because the Moon has less gravity than Earth. The force of gravity on an object is dependent on the mass of the object and the mass of the celestial body. Since the Moon has less mass than Earth, the force of gravity on the Moon is weaker, making objects feel lighter.