A block ‘B’ rests on ‘A’. A rests on a horizontal surface ‘C’ which is frictionless. There is friction between A and B. If ‘B’ is pulled to the right

There is no frictional force between A and C , when force P is applied on B , frictional force developed between A and B , will oppose the motion of B but move the body A  in the direction of applied force P , So A and B will move to the right(acceleration can be different)