detailed solution

Correct option is C

• Bimolecular reaction originates from a collision between two reactants. Whether or not a collision results in a chemical reaction is determined by the energy of the reactants and their orientation.
• The total energy of the two reactants must be in excess of the activation energy, ${\mathrm{E}}_{\mathrm{a}}$, and the reactants must be in a favorable orientation for the chemical reaction to occur. While there are many different orientations possible for the collisions, usually not all of them will result in a chemical reaction.