Two liquids of densities $$\rho_1$$ and $$\rho_2$$ ($$\rho_2 = 2\rho_1$$) are filled up behind a square wall of side 10 m as shown in figure. Each liquid has a height of 5 m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing):

A

$$\frac{1}{3}$$

B

$$\frac{2}{3}$$

C

$$\frac{1}{2}$$

D

$$\frac{1}{4}$$