The mass of the Earth is M_E and the mass of the Moon is M_M. Their respective radii are R_E and R_M.

Which is the ratio $\frac{{{\text{escape speed from the Earth}}}}{{{\text{escape speed from the Moon}}}}$?

A.     $\sqrt {\frac{{{M_{\text{M}}}{R_{\text{M}}}}}{{{M_{\text{E}}}{R_{\text{E}}}}}}$

B.     $\sqrt {\frac{{{M_{\text{E}}}{R_{\text{E}}}}}{{{M_{\text{M}}}{R_{\text{M}}}}}}$

C.     $\sqrt {\frac{{{M_{\text{E}}}{R_{\text{M}}}}}{{{M_{\text{M}}}{R_{\text{E}}}}}}$

D.     $\sqrt {\frac{{{M_{\text{M}}}{R_{\text{E}}}}}{{{M_{\text{E}}}{R_{\text{M}}}}}}$

C