Answer: C. Make Americans understand the necessity of getting involved in the war.
The "Four Freedoms" Speech was the 1941 State of the Union address. The nickname comes from the four freedoms outlined by Franklin D. Roosevelt, which he argued all people deserved (speech, worship, want and fear).
The speech defended a policy of intervention in WWII, which was a significant break from previous foreign policy. He argued that the threat to America's security was unprecedented, and therefore, required strong action.