If the bearing capacity of soil is 10 tones/cm$$^2$$ and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
A) $$D = 0.0775 a$$
B) $$D = 0.775 a$$
C) $$D = 0.775 \sqrt{a}$$
D) $$D = 0.775 a^{2}$$

A

A Only

B

B Only

C

C Only

D

D Only