I believe the correct answer is C) the creation of a unified European currency to facilitate.
The Marshal plan or European Recovery Program (ERP) was introduced by George C. Marshall, Truman's Secretary of State, and was designed to help war torn European countries to recover by remove trade barriers and modernize industry. This plan also had a goal of stopping Russian Communism from spreading. The largest recipient of Marshall Plan founds money were the United Kingdom (26%), France (18%) and West Germany (11%).