Lunch in Jamie's Dorm Is an All-You-Can-Eat Buffet, Served from 11

Lunch in Jamie's dorm is an all-you-can-eat buffet, served from 11 a.m. until 1 p.m. By noon, the buffet is picked over, and by 12:30, there are very few popular items left. The garbage bins, though, are full of food. If the cafeteria changed its policy so that students had to pay for each item chosen, students would:

A) make the same selections as before, but eat more of what they select.
B) select only the most expensive items in the buffet.
C) encounter shortages earlier in the day.
D) only select an item if its marginal benefit is greater than or equal to its price.