A ball is rotating in a horizontal plane on the end of a string of length l . (A) The rotational kinetic energy of the ball remains constant as long as the string length and angular speed are fixed. (B) When the ball is pulled inward and the length of the string is shortened, the rotational kinetic energy will remain constant due to conservation of energy, (C) but the angular momentum L will not remain constant because there is an external force acting on the ball to pull it inward. (D) The moment of inertia I remains constant and (E) the angular speed will remain the same throughout the process because the ball is rotating in the same plane throughout the motion. Select all of the statements that are false.