Which of the Following Statements Is Not Correct

Which of the following statements is not correct?

A) Some goods that are often thought of as public goods may be private goods in certain circumstances.For example, a lighthouse that protects a privately owned port may be a private good.
B) Some goods that are often though of a private goods may be public goods in certain circumstances.For example, a candy bar could be a public good.
C) Antipoverty programs can be an example of a public good because everyone benefits from living in a society with less poverty.
D) The government must provide national defense because it is impossible to exclude people from its benefit, and the consumption of national defense is nonrival in consumption.