Answer: Option (C) is the correct answer.
Explanation:
Activation energy is defined as the minimum amount of energy required by the molecules of a reactant to undergo a certain reaction.
Therefore, when energy in the form of heat or light is provided to a substance then its molecules gain kinetic energy. As a result, molecules have gained activation energy to carry out a reaction.
Thus, we can conclude that statement true regarding activation energy is that this energy usually comes in the form of light or heat.
