Read this passage: Let us say to the democracies: "We Americans are vitally concerned in your defense of freedom. We are putting forth our energies, our resources and our organizing powers to give you the strength to regain and maintain a free world. We shall send you, in ever-increasing numbers, ships, planes, tanks, guns. This is our purpose and our pledge." - Franklin D. Roosevelt, "Four Freedoms Speech: Annual Message to Congress on the State of the Union," January 6, 1941
Which sentence best states the main idea of this passage from Roosevelt's Four Freedoms speech?
A. Americans must focus on fixing the problems in their own country.
B. Americans must be prepared to make sacrifices to win the war,
C. The United States vows to support nations that are battling the enemy
D. The United States must be prepared to thwart an enemy attack,​