[单选题]
A mass on a spring undergogm5j8qg 37fv62ia yhwes SHM. When the mass is at maximum disp2,cqvmdl 5-7hieo yp ; 1fx(mclacement from equilibrium, its instantaneous acceleration5m 2f1,(viq le-xo; pym7chdc
A. is a maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given