Which of the following activities is a basic function of a quick-serve restaurant?

The activity of purchasing is a fundamental function of a quick-serve restaurant. This is because purchasing involves acquiring the necessary ingredients and supplies that are essential for production and service in a restaurant environment. Quick-serve restaurants often operate at a high volume with a focus on efficiency and cost-effectiveness, which makes effective purchasing crucial. It includes selecting suppliers, negotiating contracts, and managing inventory levels to ensure that the restaurant has the required items on hand to meet customer demand while minimizing waste and controlling costs.

While testing might refer to things like menu item development or quality control, licensing usually involves legal permissions to operate and isn't a day-to-day function. Regulating pertains more to adhering to laws and standards and does not fall under the operational activities of a quick-serve establishment. Hence, purchasing aligns directly with the core activities that keep the restaurant running smoothly and efficiently.