Which of the Following Is an Example of an External

Multiple Choice

Which of the following is an example of an external benefit?

A) More people start to ride the bus because they become more public‐spirited and, as a result, air pollution is reduced.
B) Firms are able to reduce their costs of production by using a more efficient technology.
C) The federal government spends a million dollars on improving national parks.
D) A firm has just gotten permission to open a landfill on property that is adjacent to your home.