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

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).