Concept:An international organisation is one whose membership includes multiple countries.
Domestic groups operate only within one country and are not international bodies.
Explanation:O.A.U., U.N.O., and the Commonwealth of Nations are all international organisations.
Each body includes member states working together on political, economic, or social issues.
A pressure group is a national or local association that influences policies within a single country.
It does not have sovereign states as members and is not formed through an international treaty.
Answer:A. pressure group