[单选题]
The horizontal component of the o*rbol4 p*em 3butto.gyy6)f.j t0qwei ftc,y o/ 6ressing force at the base of a pointed arch q,)te icfgf6 t jyyoywo/0.6.is
A. less than that of a rounded arch.
B. equal to that of a rounded arch.
C. greater than that of a rounded arch.
D. zero in magnitude.
