The correct answer is A. Roosevelt makes an inference that his audience believes America can escape aggresion. This is a logical inference, because America has isolated itself in hopes of avoiding being drawn into a conflict.
The Quarantine Speech was pronounced by Franklin Delano Roosevelt, president of the United States of America, on October 5, 1937 in Chicago, in a very tense world political situation due to the aggressions of Nazi Germany, Fascist Italy and the Empire of the Japan. The President affirmed that the nations responsible for wars and "international illegalities" should have been isolated from other peaceful countries and kept in quarantine, as contagious organisms, to prevent the spreading of the "disease" of violence, aggression and oppression.
Roosevelt did not explicitly indicate the aggressive nations that were the object of his speech, but, for the first time, he seemed to evoke the possibility of the United States coming out of a policy of strict neutrality and intervening concretely in world politics. The quarantine speech caused considerable controversy both within the United States and internationally and was sharply criticized by the American isolationists.