A solid shaft of 100mm diameter transmits 160 HP at 200rpm. The modulus of rigidity $$c = 8 \times 10^5 kg/cm^2$$ .Then the maximum angle of twist for a length of 6 meteris

A

$$5^\circ$$

B

$$2.5^\circ$$

C

$$3.2^\circ$$

D

$$2^\circ$$