Final answer:
The primary role of the Marshall Plan was to provide aid to European countries for reconstruction and industrialization.
Step-by-step explanation:
The primary role of the Marshall Plan, also known as the European Recovery Program, was to provide aid to European countries to reconstruct and modernize industry.
With an eventual total of $12 billion, the Marshall Plan helped Europe rebuild their infrastructure and restore their industrial capacity, which had been heavily damaged during World War II. The funds were used to purchase necessary materials, often from the United States, which also helped prevent an economic depression in the US after the war.