Read the paragraph.

Following the Second World War (1939–1945), the United States worked to help rebuild the nations of Europe. The Marshall Plan offered more than $12 billion in aid. By 1952, industrial production and living standards in much of Europe had again risen to prewar standards.

Which most accurately explains why helping to rebuild postwar Europe was in the interest of the United States?

A. The United States felt responsible for starting the Second World War.
B. Nations who were dependent on this postwar aid eventually became part of the United States.
C. Humanitarian causes have always been important to United States citizens.
D. A strong economy in Europe would provide stability to thwart the growth of Communism.