If ($$\varphi $$) is the angle of repose of soil of weight w kg/m³, the horizontal pressure p at a depth of h meters per metre length of wall, is

A. $${\text{wh}} \times \frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}$$

B. $$\frac{{{\text{wh}}}}{2} \times \frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}$$

C. $${\text{wh}} \times \sqrt {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} $$

D. $${\text{wh}} \times \sqrt {\frac{{1 + \sin \varphi }}{{1 - \sin \varphi }}} $$

Answer: Option A