Which of the Following Would Be an Example of a Protective

Which of the following would be an example of a protective tariff?

A) the government imposes a tax on imported toys containing lead paint in order to protect American children.
B) the government imposes a tax on imported steel to protect domestic steel producers from competition with lower prices imports.
C) the government imposes a tax on companies with high pollution levels in order to protect the environment.
D) the government imposes a tax on imported goods made with forced labor or child labor in order to protect American workers from competition with goods made under such conditions.