The correct answer is Walking on a wet marble floor.
Walking on a wet marble floorbecomes difficult without a frictional force.
Frictional Force-It is the force generated by two surfaces that contact and slide against each other.
One can also say that friction is the resistance to the motion of one object moving relative to another.
There is friction between our foot and the non-smooth surface. On the non-smooth force, we push the ground backward while walking and a frictional force acts in the opposite direction (forward direction). This prevents our foot from slipping backward.
On a wet marble floor, the friction is very less on the smooth surface. Hence, it is difficult to move without friction.