Which of the following is a form of energy?

• A. Density
• B. Temperature
• C. Potential energy
• D. Color

Answer: (C)

Energy exists in different forms, with potential energy being energy stored due to an object's position or configuration. A rock perched on a hill has gravitational potential energy because its height means gravity can do work on it if it moves downward. Similarly, stretching a spring stores elastic potential energy in the spring itself. These examples show energy waiting to be released to do work, just by virtue of how things are arranged or positioned.

Density is a property of matter—mass per volume—so it describes how compact matter is, not a way energy is stored or transferred. Temperature measures how hot something is and reflects the average kinetic energy of its particles, but it’s a scale for energy content rather than a form of energy itself. Color describes the wavelength of light we perceive; light carries energy, but color by itself isn’t a distinct form of energy.

So, the form of energy represented here is potential energy.