Which of the following becomes difficult without a frictional force?

Correct option is D

Walking on a wet marble floor becomes difficult without a frictional force. Walking requires friction between your shoes and the ground to create enough grip to propel yourself forward. On a wet marble floor, the reduced friction makes it harder to walk without slipping.
· Moving a heavy box: Friction between the box and the floor provides the grip needed to push or pull it. Without friction, the box would simply slide freely in any direction.
· Playing carrom: The smooth surface of the carrom board relies on friction between the striker and the carrom board to impart force and control the movement of the carrom men. Without friction, the striker would slip and the carrom men wouldn't move as intended.
· The movement of door: Friction between the door hinge and the door frame allows the door to swing open and closed smoothly. Without friction, the door would be difficult to control and might slam shut or swing open too easily.