[单选题]
A mass on a spring undergoes SHM. oedjqm 5c ;,*d When thczh4uy8ep+4b aby r68 o.i3oge mass passes through the equilibrium position, itr 68hgc.4i3y48eoybbza+uo p s instantaneous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
