Explain why the answer is not A and the correct answer

(D) OJ 5. A child slides from rest down slides A and B shown below. The slides are the same height, and the coefficient of friction between the slides and the child is the same. Which of the following compares the change AK in the kinetic energy of the child and the change AU in the potential energy of the child-Earth system for the two slides? )AKA = AKB ; AUA = AUB B) AKA AUB (C) AKA> AKB; AUA = AUB ( D) AKA > AKB; AUA > AUB