The boy is most___________to make a great difference in the future, because he is so bright. Besides, he works extremely hard. 

A．likely

B．possibly

C．probably

D．perhaps

如图所示，重为G = 10N的物体在动摩擦因数为0.2的水平面上向左运动，同时受到大小为8N的方向向右的水平力F的作用，则物体所受的合力大小是     N；方向为               。