Answer :
Final answer:
Buyer surplus is the additional benefit consumers receive when they pay less for a product than they are willing to pay.Therefore, correct option is d).
Explanation:
Buyer Surplus: Buyer surplus is the additional benefit that consumers receive when they pay less for a product than they are willing to pay. It represents the difference between what consumers are willing to pay and what they actually pay for a good or service. In the context of the question, it relates to the willingness to pay for the last chocolate bar for Bill and Ted.