Which of the following is listed as a form of energy?

• A. Volume
• B. Potential energy
• C. Density
• D. Time

Answer: (B)

Energy comes in different forms, and one of them is potential energy—the stored energy due to position or configuration. This kind of energy can do work when the system changes state, like a stretched spring or an object elevated above the ground. The other terms describe properties or measures, not forms of energy: volume is the amount of space an object occupies, density is mass per unit volume, and time is a dimension used to track change. Because potential energy represents stored capability to perform work, it is the correct form of energy among the options.