The emissive power of a black body at T=...

The emissive power of a black body at `T=300K` is `100Watt//m^(2)` consider a body B of area `A=10m^(2)` coefficient of reflectivity `r=0.3` and coefficient of transmission `t=0.5` its temperature is 300 K. then which of the followin is correct:

The emissive power of B is `"20 W/m"^(2)`

The emissive power of B is `"200 W/m"^(2)`

The power emitted by B is 200 Watts

The emissivity of B is 0.2

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