[单选题]
A mass on a spring undergoes SHM. When the mass is at its maximum displacuregl)0lzb 54ementpz62g 1vtu++9bikihv from equilibrium, its t z1ii+u2 +vk96gvbp hinstantaneous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
