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.
Refer to the information given above.The buffet in Jamie's dorm is an example of:

A) a Coase-like solution to externalities.
B) a tragedy of the commons.
C) excess supply in the market.
D) a good with positive externalities.