Answer: The correct answer is Option 3.
Explanation:
Energy is defined as the capacity to do work such as moving an object.
For the given options:
- Combustion is a type of reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide and water molecule.
- Exothermic is a type of reaction in which heat is released as the products are formed.
- Thermal energy is possessed when heat is produced. This heat is produced due to the movement of particles in an object.
- Electrolytic cell is an electrochemical cell that undergoes a redox reaction through electrical energy.
Hence, only thermal energy is a form of energy. Therefore, the correct answer is Option 3.