The radius of circle the period of revolution initial position and sense of revolution are indicated in the fig y-projection of the radius vector of rotating particle P is:

Question

( A ) $y(t)=3\cos[\frac{3\pi t}{2}]$,where y in m
( B ) $y(t)=4\sin[\frac{\pi t}{2}]$,where y in m
( C ) $y(t)=3\cos[\frac{\pi t}{2}]$,where y in m
( D ) $y(t)=-3\cos2\pi t$,where y in m