A wire of 10-2 kgm-1 passes over a frictionless light pulley fixed on the top of a frictionless inclined plane which makes an angle of 30° with the horizontal. Masses m and M are tied at two ends of wire such that m rests on the plane and M hangs freely vertically downwards. The entire system is in equilibrium and a transverse wave propagates along the wire with a velocity of 100 ms-1. Then,
(A) M = 5kg
(B) m/M = 1/4
(C) m =20kg
(D) m/M = 4