Read this passage from a letter sent to U. S. president Harry S. Truman by H-o Chi Minh in 1946: On behalf of Vietnam government and people I beg to inform you that in course of conversations between Vietnam government and French representatives the latter require the secession of Cochinchina and the return of French troops in Hanoi. Meanwhile French population and troops are making active preparations for...military aggression. I therefore most earnestly appeal to you personally and to the American people to interfere urgently in support of of our independence and help making the negotiations more in keeping with the principles of Atlantic and San Francisco charters.

President Truman never responded to this letter. Which statement best explains why the United States would refuse to respond to H-o Chi Minh request?

A. Vietnam's independence movement was led by communists.
B. France threatened to attack the United States if it defended Vietnam.
C. Great Britain had already agreed to fight with Vietnam against France.
D. The United States was busy supporting India's independence movement.