The correct answer is: A. Substitution
Benzene is a very stable molecule because of its resonance structure. This means that the electrons in the pi bonds are delocalized throughout the entire ring, making it difficult to break the pi bonds and substitute another atom or group of atoms into the ring.
Addition reactions are possible with benzene, but they require very strong reagents, such as bromine or nitric acid. These reagents can break the pi bonds in the benzene ring and add the bromine or nitric acid molecules to the ring.
Elimination reactions are also possible with benzene, but they require very strong bases, such as potassium hydroxide. These bases can remove a hydrogen atom and an alkyl group from the benzene ring, leaving behind a double bond.
Oxidation reactions are not possible with benzene, because the benzene ring is very stable. The oxygen molecule would need to break the pi bonds in the benzene ring in order to react with it, but this is not possible.
Here is a diagram of the resonance structure of benzene:
As you can see, the electrons in the pi bonds are delocalized throughout the entire ring. This makes it difficult to break the pi bonds and
substitute another atom or group of atoms into the ring.