Answer: C) The enormity of the threat to democracy.
Explanation: In literature, the theme is the underlying message of a story, it is what critical belief about life is the author trying to convey in the writing of a novel, play, short story or poem. Usually this belief, or idea, is universal and transcends cultural barriers. In the given excerpt we can see developed the theme of the enormity of the threat to democracy, because Roosevelt is explaining how important is the defense of the democracy in all the continents.
