A Crank Is Being Turned Clockwise at 120 Rev/min

Multiple Choice

A crank is being turned clockwise at 120 rev/min. The handle is 10 cm from the axle of the crank. An observer some distance away sees the crank edge-on so he only perceives the vertical motion of the crank and not the horizontal motion. What equation describes the motion of the handle seen by the observer if at t=0 the crank is at y = 0 and moving in the negative y direction?

A) y = (10 cm) cos((12.6 rad/s) t +3π/2)
B) y = (10 cm) cos((12.6 rad/s + π) t)
C) y = (10 cm) cos((12.6 rad/s) t - π/2)
D) y = (10 cm) cos((12.6 rad/s) t)
E) y = (10 cm) cos((12.6 rad/s) t + π/2)