Answer:
The correct option is C. Reactants need to gain energy to break bonds and to form new ones.
Explanation:
The Collision Theory explains the fact that for a chemical reaction to occur, the reactants must collide with one another with a force which breaks the bonds in the reactants, so that new bonds can be formed among the reactants. If molecules do not collide with a certain force, the chemical reaction won't occur. The energy with which the molecules collide is termed as the activation energy. The more the concentration of reactants, the more are the chances of collisions and the more will be the activation energy.
