Final answer:
The change in total revenue from each additional surfboard rented at Sue's Surfboards is called marginal revenue.
Step-by-step explanation:
The change in total revenue from each additional surfboard rented at Sue's Surfboards is called marginal revenue. Marginal revenue represents the additional revenue generated by selling one more unit of a product and is equal to the change in total revenue divided by the change in the quantity of surfboards rented. In this case, the marginal revenue is not equal to the rental price of a surfboard, so option (d) is incorrect. To determine the correct answer, we need more information about the rental price and the relationship between total revenue and the quantity of surfboards rented.