Which of the Following Would Be Considered an Interest Group

Which of the following would be considered an interest group in the United States?

A) The National Security Council,which advises the president on security issues.
B) The United States Department of State,which seeks better relations with other countries.
C) The Pentagon,which provides information to the president.
D) The Cuban American National Foundation,a Florida-based group seeking increased democracy in Cuba.
E) The Iraq Study Group,a panel appointed by the government to prepare a report on the 2003 Iraq War.