If is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is________________?

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If is the overall height of a retaining wall retaining a surcharge, the width of the base slab usually provided, is________________?

A. 0.3 H
B. 0.4 H
C. 0.5 H
D. 0.7 H(Correct)