National Defense Is a Classic Example of a Public Good

Multiple Choice

National defense is a classic example of a public good because

A) there is no market for private security services.
B) it is difficult to exclude people from receiving the benefits from national defense once it is provided.
C) everyone agrees that some level of national defense is important, but only the government knows the optimal amount.
D) there are no private firms willing to supply defense goods such as tanks and weapons.