Please choose the correct answer to the question: One 7.0 kg bowling ball is lifted to a storage shelf 1.0 m above the floor. A second 7.0 kg ball is lifted to a storage shelf 2.0 m above the floor. Which of the following best explains why the measured force of gravity on each ball is nearly identical?

Answer1: The final potential energy of each ball increased. Answer2: The amount of work required to lift each ball is identical. Answer3: The distance of each ball from Earth's center of mass is almost identical. Answer4: The gravitational force of each ball on the other cancels out the force of Earth's gravity.

Answer format: answer1/answer2/answer3/answer4