Answer: Option (a) is the correct answer.
Step-by-step explanation:
Rate of reaction is defined as the rate consumed by the reactants to result in the formation of products.
For example, when Ben observes how quickly some dry wood is burning in a campfire then it basically depicts the rate of combustion of wood.
Activation energy is the minimum amount of energy required by reactant molecules to undergo a chemical reaction.
Thus, we can conclude that in the given situation reaction rate best relates to Ben’s observation.