A semi$-$circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semicricular disc and horizontal surface is $.$ This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

A$.$Remain horizontal

B$.$Slant up towards direction of pull

C$.$Slant down towards direction of pull

D$.$Unpredictable