Which scenario is most likely to generate an externality?

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A student consumes a burger in the campus cafeteria.A student enjoys reading a book for entertainment.A student stays home and watches television alone.A student throws a party in her dormitory room.A student studies quietly in the library.

Explanation

An externality occurs when an individual's actions affect others who are not involved in the activity. Eating a burger, reading, or watching TV are generally private activities with no impact on others. However, hosting a party in a dorm room can create noise or disturbances, affecting neighbors and thus producing an externality.