[单选题]
A mass on a spring undergoes SHM. When the mass pas h /8+y2.dl(zh bpgymeses through the equilibriluz1 g a-.k3u qkhl:h2um position, its instant lh:qkku1au h2 -.lz3ganeous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
