Final answer:
All the options provided - Chemical, Electrical, and Gravitational energy - are indeed forms of energy. They are involved in various processes and can be transformed into one another to do work.
Step-by-step explanation:
The question asks which option is NOT a form of energy. Looking at the options provided, A. Chemical, B. Electrical, and C. Gravitational, and comparing them to knowledge of different energy forms, it becomes clear that all of these are indeed forms of energy. Chemical energy is stored in the bonds of chemical compounds and is released or absorbed during chemical reactions; electrical energy is associated with the movement of electric charges; and gravitational energy is the potential energy a body with mass has in relation to another massive object due to gravity.
Common forms of energy include chemical energy, which is essential for human functioning and is released as chemical bonds are formed and broken; electrical energy, the power of moving electrons and is a typical form that converts to many other forms; nuclear energy, which is released from processes that convert mass into energy; and thermal energy, relating to the internal motion of atoms and molecules.