On Saturdays, Stan Goes to the Park to Play His

Multiple Choice

On Saturdays, Stan goes to the park to play his saxophone. Some of the people in the park love listening to Stan play, while others find his music really annoying. In this case, Stan's saxophone playing generates:

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