The correct answer is: C. Chemical energy
Chemical energy is the potential energy stored in chemical bonds. When these bonds are broken, the energy is released. This is what happens when a battery is used. The chemical reactions inside the battery release energy, which is then used to power devices.
Option A, electrical energy, is the energy that is produced by the flow of electrons. This is the energy that is used to power devices when a battery is connected to them. However, the electrical energy in a battery is not the source of the energy that powers the battery. The electrical energy is a result of the chemical reactions that take place inside the battery.
Option B, mechanical energy, is the energy of motion. This is not the source of the energy that powers a battery. The chemical reactions inside the battery do not involve any movement of parts.
Option D, solar energy, is the energy that comes from the sun. This is not the source of the energy that powers a battery. Batteries do not use solar energy to power themselves.
Option E, none of the above, is not the correct answer. The correct answer is C, chemical energy.