Answer: The correct option is C.
Explanation: Normal force is the reaction force which acts normal to the surface.
Tension force is the force which remains in the string and as there is no string attached to the box. So, no tension force will act on it.
Friction force is the force which acts opposite to the force acting on the object.
Force of gravity is the force that attracts any object with mass.
To move a box, we need to overcome the force which is acting opposite to it, which is the frictional force. Hence, the correct option is C.
