Final answer:
Potential energy increases with conservative forces.
Step-by-step explanation:
Potential energy and conservative force have a direct relationship. A conservative force is the negative derivative of potential energy. When a force is conservative, it is possible to define a potential energy associated with the force.
For example, when an object is lifted against gravity, its potential energy increases. The increase in potential energy is due to the work done by the conservative force of gravity.
Therefore, the correct answer is c) Potential energy increases with conservative forces.