Which of the Following Is True of the Sherman Act

Which of the following is true of the Sherman Act?

A) It applies to the conduct of American business abroad when that business has a direct effect on American commerce.
B) It applies only to the conduct of all businesses based in the United States.
C) If a business was conducted entirely abroad,it is outside the purview of the Sherman Act.
D) If an American firm enters into an agreement with another nation,it cannot be sued for violations under the Sherman Act.