[单选题]
A mass on a spring undergoes SHM. When the ma. ha/qngpc5 h.ss is esh8tm:1rbrb -z k; u4at maximum displacement from equilibrium, its inbt1m-su 4ezrhkr;8 b:stantaneous acceleration
A. is a maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given
