A spherical body of emissivity e = 0.6 and area A and placed  inside a perfectly black body is maintained at temperature T, then energy radiated per second will be:

• A

  $\mathrm{E}=0.4 {\mathrm{\sigma AT}}^4$

• B

  $\mathrm{E}=0.8 {\mathrm{\sigma AT}}^4$

• C

  $\mathrm{E}=0.6 {\mathrm{\sigma AT}}^4$

• D

  $\mathrm{E}=1.0 {\mathrm{\sigma AT}}^4$