[单选题]
A mass on a spring undergoes SHh.;)elzq: hjulf2 qb ,++k( yi0bbusfM. When the mass passes through the equilibr*j rfs-n)t 4ywu 6,iozium positio*i )tjfw-r,zuyn6os4 n, its instantaneous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
