Assuming the Sun to be a spherical body of radius $$R_S$$ and surface temperature $$T$$, the total radiation power received by Earth of radius $$R_E$$ at a distance $$r$$ from Sun is

A

$$\frac{\sigma\pi R_E^2R_S^2T^4}{r^2}$$

B

$$\frac{4\sigma\pi R_E^2R_S^2T^4}{r^2}$$

C

$$\frac{\sigma\pi R_E^2R_S^2T^4}{4r^2}$$

D

$$\frac{\sigma R_E^2R_S^2T^4}{4\pi r^2}$$