Two books are located 2 m above the surface of the Earth. The first has a mass of 4 kg; the second has a mass of 2 kg. Which statement about the pull of Earth's gravity is true?

A.The force of Earth's gravity on the 2-kg book is stronger than the force of Earth's gravity on the 4-kg book. B.The force of Earth's gravity is the same on both books, because the two books are located at the same height above the Earth. C.The force of Earth's gravity is the same on both books, because when they're dropped, they'll both accelerate at 9.8 m/s2. D.The force of Earth's gravity on the 4-kg book is stronger than the force of Earth's gravity on the 2-kg book.