[单选题]
A mass on a spring undergoes SHM. When the mass passe5vvl5pwxgffa raw:m ;( -9vl3 h.8ffd s through the equi)xat aqr ,;,+zwpqp;ilibrium p,wp+ );i;r paatxq, qzosition, 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.
