Answer: I think it is Nancy is in the library looking for a book. She is talking to herself and consequently disturbs a few people in the library.
Explanation:
There are good externalities and bad externalities in economics. A good externality is when for example a farm of flowers is situated next to a producer of honey. The farmer benefits from the polinization of his flowers and the honey producer from the pollen and nectar that bees take from the flowers to produce honey. A negative externality is something like in the case mentioned of Nancy who reads aloud and disturbs other people in the library and doesn't let them read peacefully.
The correct answer would be D or Religion.
The flies invade the body within minutes of the pwrson been dead