[单选题]
A mass on a spring undergoes SHM. When the o kls)6tmcu *o;;mjww znu 5(9mass is at its p *up8/s k2mrcmaximum displacement from equilibrium, its insta2rmku8s pcp/* ntaneous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
