Depending on the radiating properties, body will be transparent when

Q. Depending on the radiating properties, body will be transparent when

A.            p = 0, x = 0 and a = 1

B.            p=l,x = 0,anda = 0

C.            p = 0, T= l,anda = 0

D.            X = 0, a + p = 1

Answer: p = 0, T= l,anda = 0