Final answer:
Based on the context referring to the optimal amount of restored land and marginal costs and benefits, Jarmo covers about 300 acres of the top of a bluff, but the area below the bluff cannot be definitively determined from the information provided.
Step-by-step explanation:
The question seems to be related to a scenario regarding the optimal amount of land to be restored at the top of a bluff, suggesting that the correct answer involves a consideration of economic principles such as marginal costs and benefits. Given this information, we can infer that the correct answer is that Jarmo covers about 300 acres of the top of a bluff. Below the bluff, the scenario does not provide sufficient information to determine what lies underneath, therefore based on the options provided in the question as they are, it is not possible to conclude what exactly is located below the bluff. However, given the context, where marginal costs and benefits are mentioned, it sounds like a scenario that might involve environmental economics, which is closely related to the optimal use of land and resources.