Two Perfectly Absorbing Spheres Have Radii of R and 3R

Multiple Choice

Two perfectly absorbing spheres have radii of R and 3R. Both are held at the same temperature. The flux of radiant energy emerging from each square meter of the larger sphere is

A) the same as the flux from the smaller sphere.
B) 3 times the flux from the smaller sphere.
C) 9 times the flux from the smaller sphere.
D) 27 times the flux from the smaller sphere.