When you roll a ball across the floor, it eventually slows down and stops due to the force of:

a) friction

b) force

c) inertia

d) mass

C. Inertia

This answer is found from the process of elimination.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.