[单选题]
A mass on a spring undep59.w u 5ozi d(l/fggzrgoes SHM. Whe1i( , ezwj2zqon the mass passes through the equilibrium position, itq2zwe(i 1,j zos instantaneous velocity
A. is maximum.
B. is less than maximum, but not zero.
C. is zero.
D. cannot be determined from the information given.
