A circular shaft subjected to torsion undergoes a twist of $$1^\circ$$ in a length of 120 cm. If the maximum shear stress induced is limited to $$1000 kg/cm^2$$ and if the modulus of rigidity $$G = 0.8 \times 10^6 kg/cm^2$$, then the radius of shaft in cm should be

A

$$\frac {\pi}{18}$$

B

$$\frac {\pi}{27}$$

C

$$\frac {18}{\pi}$$

D

$$\frac {27}{\pi}$$