What is the ratio of the acceleration due to gravity on two planets with radii $R_1$ and $R_2$ and densities $\rho_1$ and $\rho_2$?
- A$g_1:g_2 = \frac{\rho_1}{R_1^2} : \frac{\rho_2}{R_2^2}$
- B$g_1:g_2 = R_1 R_2 : \rho_1 \rho_2$
- C$g_1:g_2 = R_1 \rho_2 : R_2 \rho_1$
- D$g_1:g_2 = R_1 \rho_1 : R_2 \rho_2$
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