Two Identical Silver Spheres of Mass M and Radius R

Multiple Choice

Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun respectively.The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is:

A) 0.25.
B) 0.50.
C) 1.0.
D) 2.0.
E) 4.0.