A stone is swinging in a horizontal circle of diameter 0.8 m at 30 rev/min. A distant light causes a shadow of the stone on a nearly wall. The amplitude and period of the SHM for the shadow of the stone are
(a) 0.4 m, 4 s
(b) 0.2 m, 2 s
(c) 0.4 m, 2 s
(d) 0.8 m, 2 s