They are in _____ school, but in _____ classes. [ ]

A. same; different

B. the different; the same

C. the same; different

D. same; the different

如图所示，原长为L的软弹簧上端固定，下端挂一小重球，从图示位置A处释放时，弹簧仍长为L，小球从A运动到最低位置B的过程中，_________能减少，_________能增加了．