Problem $8$ A concrete gravity retaining wall having a unit weight of $150pcf$ is shown in the figure. Use the Rankine active earth pressure theory and neglect the wall friction. The factor of safety against the overturning about the toe at $p{o}^{\text{i}\text{n}\text{t}}O$ ic most nearly:

A$)3\mathrm{.}1$

B$)2\mathrm{.}5$

C$)2\mathrm{.}2$

D$)0\mathrm{.}3$