A Loud Band Plays a Concert Late at Night in a Neighborhood

A loud band plays a concert late at night in a neighborhood park. The noise produced by the band that keeps the neighbors not attending the concert awake is

A) only a private cost.
B) only an external cost.
C) both a private cost and an external cost.
D) neither a private cost nor an external cost.
E) private benefit because the neighbors get to hear the band.