If P₁ and P₂ Are Effective Lateral Loadings at the Bottom

Multiple Choice

If p₁ and P₂ are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

A) (p₁?p₂) /2h
B) (p₁+p₂) /4h
C) (p₁+p₂) /2h
D) (p₁?p₂) 2/3h