Consider two solid spheres of radii $$R_1 = 1$$ m, $$R_2 = 2$$ m and masses $$M_1$$ and $$M_2$$, respectively. The gravitational field due to sphere (1) and (2) are shown. The value of $$\frac{M_1}{M_2}$$ is:

A

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

B

$$\frac{1}{6}$$

C

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

D

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