Final answer:
Sage is responsible for buying raw potatoes for the benefit dinner, as there is no information suggesting involvement in cooking, financing, or supervising dinner preparations.
Step-by-step explanation:
The question asks about Sage’s role in preparing for a benefit dinner, specifically in relation to roasted potatoes. Based on the information provided, the most accurate assertion is: A. Sage is responsible for buying raw potatoes. This statement directly implies that Sage's duty is to purchase the uncooked potatoes that will be used to prepare the roasted potatoes for the benefit dinner. There is no mention in the scenario given that Sage is involved in cooking the potatoes, contributing financially to the dinner aside from purchasing potatoes, or supervising the dinner preparations. Therefore, only answer A is supported by the details provided about Sage’s role.