In Which of the Following Situations Would a Negative Externality

In which of the following situations would a negative externality most likely be involved?

A) It is night and Kenneth is sitting in his easy chair reading a novel by John Grisham.The lamp he is reading by has only a 40-watt light bulb.He is having a hard time reading.
B) Alyson lives near an airport.At five o'clock in the morning every day she can hear the airplanes taking off and it awakens her.
C) Lucy went to a fancy restaurant last night and ordered the most expensive meal on the menu.She hated it.
D) Richard is taking an economics class from Professor Franklin.Professor Franklin often says things that confuse Richard.