Carmen Listens to Opera Music Every Evening When She Gets

Carmen listens to opera music every evening when she gets home from work. Carmen loves listening to opera, but her neighbor Paul, who can also hear the music, hates it. If Paul is the only person besides Carmen who can hear the music, then Carmen's music generates:

A) a negative externality.
B) a positive externality.
C) neither a positive nor a negative externality.
D) both a positive and a negative externality.