The radii of two planets are respectively `R_(1) and R_(2)` and their densities are respectively `rho_(1) and rho_(2)`.The ratio of the accelerations due to gravity at their surface is
A. `(R_(2))/(R_(1))(rho_(1))/(rho_(2))`
B. `(R_(1))/(R_(2))(rho_(2))/(rho_(1))`
C. `(R_(1)rho_(1))/(R_(2)rho_(2))`
D. `sqrt((R_(1)rho_(2))/(R_(2)rho_(1)))`