The cafeteria of a certain elementary school provides a free lunch every day to the entire student body - a significant expense in the school's annual budget. A vice principal was exploring cost-reducing measures that would not compromise nourishment. A local Italian restaurant offered the school a large number of pizzas at a vastly reduced bulk rate. The pizzas were served one day, and afterward, the vice principal calculated that the cost of the pizza and delivery was slightly more than the average cost of typical cafeteria lunch day. Therefore, he concluded that the school could not save money by replacing a day of cafeteria lunch with a day of pizza from this restaurant.

Which of the following would be most useful for evaluating the conclusion drawn by the vice principal?

A:How many pizzas were uneaten at the end of that day's lunch.

B:Whether pizza provides the same level of nutrition as a typical cafeteria lunch.

C:Whether another Italian restaurant in this town would provide a similar deal and offer free delivery.

D:Whether other, more expensive dishes from that Italian restaurant, would provide a more balanced and varied set of nutrients.

E:Whether the faculty preferred the pizza to the typical cafeteria lunch.