A student's dorm room overlooks the track and field complex that will host the Olympic trials. Which represents a positive externality of having the track located in such close proximity to the room?
A. The loudspeakers wake the student early in the morning on the Saturday of the trials.
B. The student can view the competition from her room free of charge.
C. The quiet ambiance of the grounds around the student's dorm is disrupted by the crush of tourists and athletes.
D. The student will not be able to find a parking spot within 10 blocks of her room.
