If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q ?

Question

( A ) $(\frac{Q}{4\pi R^2\sigma})^\frac{1}{4}$
( B ) $(\frac{4\pi R^2 Q}{\sigma})^\frac{1}{4}$
( C ) $(\frac{Q}{4\pi R^2\sigma})^-\frac{1}{2}$
( D ) $(\frac{Q}{4\pi R^2\sigma})$