Two Spheres Are Made of Conducting Material

Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1. What is the ratio of the capacitance of Sphere #2 to the capacitance of Sphere #1?

A) 1, since all conducting spheres have the same capacitance.
B) 2
C) 4
D) 8
E) A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor.Thus, none of the answers above is correct.