$(8$ points$)$ Problem$\mathrm{.}1.$ True or false?

A$)$ When analyzing a retaining wall using Coulomb's theory, the weight of the soil above the wall is one of the vertical forces in the body diagram.

B$)P_a.($Rankine conditions$)$ is not a function of whether the soil behind the wall has a surcharge or

not.

C$)$ After analyzing a wall, it was determined that the factors of safety for overturning, sliding, and bearing capacity are all $=2\mathrm{.}5.$ The design of the wall is fine.

D$)$ Ignoring Pp in the F$.$S$.$ calculations, makes the design more conservative.