Which is the best example of the united states' use of humanitarian aid as a tool of diplomacy? . . a). the marshall plan . . b). the monroe doctrine . . c). the truman doctrine . . d). the gulf of tonkin resolution

Between 1948 and 1952, the United States spent approximately $12.7 billion in a program known as the Marshall Plan. This program provided funding to the war-torn countries of Europe in an effort to eradicate famine and rebuild their infrastructures and economies. A second diplomatic goal of the Marshall Plan was to help stop the spread of Communism into these unstable nations.

so Its A. Marshall Plan

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.

what are the answer choices?