[单选题]
00.08: A pendulum is (y,av d bz9qgb,3tk8o tlo:4bpulled to one lory)xz,x5. t side and released. It swings freely to the opposite side and s5 ) xyt,orxl.ztops. Which of the following might best represent graphs of kinetic energy $E_k$, potential energy $E_p$ and total energy $E_T$?