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A solid conducting sphere of radius $R_1$ is surrounded by another concentric hollow conducting sphere of radius $R_2$. The capacitance of this assembly is proportional to

• A
  $\frac{{{R_2} - {R_1}}}{{{R_1}{R_2}}}$
• B
  $\frac{{{R_2} + {R_1}}}{{{R_1}{R_2}}}$
• C
  $\frac{{{R_1}{R_2}}}{{{R_1} + {R_2}}}$
• ✓
  $\frac{{{R_1}{R_2}}}{{{R_2} - {R_1}}}$