Which of these is an example of potential energy?

Potential energy is the stored energy of an object due to its position or state. In this context, chemical energy is a prime example of potential energy because it is stored in the bonds of molecules. When these bonds are broken during chemical reactions, such as digestion or combustion, the stored energy is released to perform work or produce heat.

Chemical energy exemplifies how energy can be contained within the structure of molecules, making it a form of potential energy that can be converted into kinetic energy when the conditions allow for the bonds to break and react.

Other forms of energy listed, such as thermal energy, mechanical energy, and electrical energy, are primarily associated with the activities or movement of particles (kinetic energy) rather than being stored in a potential state. Thus, in the context of this question, chemical energy stands out as the correct example of potential energy.