The mass and radius of planet one are $$M$$ and $$R$$ respectively. Assume that both the planets have spherical shape. Acceleration due to gravity on the surface of planet-one and planet-two are g1 and g2 respectively. $$g_1/g_2$$ must be

A

$$1\colon2$$

B

$$2\colon1$$

C

$$1\colon4$$

D

$$4\colon1$$