Which example would most likely decrease friction? using cleats, rather than gym shoes, on a field using shaving cream, rather than shaving on dry skin using a wide parachute, rather than a narrow parachute, when skydiving using sandpaper, rather than regular paper, on wood

The answer is: using shaving cream, rather than shaving on dry skin.

Friction is the force resisting the relative motion of solid surfaces, fluid layers and material elements sliding against each other.

Shaving would be much easer using shaving cream, because friction is decreased.

This is example of decreasing skin friction.

Skin friction is the force resisting the motion of a fluid across the surface of a body.

Other examples cause increase of friction.

the dependant variable is spilled water

the independent is the heat