C. The phrase that most accurately sums up Franklin D. Roosevelt's purpose is to get the public to start being more optimistic about the country, i.e., option C.
More about Franklin D. Roosevelt:
On Saturday, March 4, 1933, Franklin D. Roosevelt took office as the 32nd President of the United States in Washington, D.C., in the East Portico of the US Capitol.
Getting people to start feeling more hopeful about the country best sums up Franklin D. Roosevelt's goal. Therefore, choice C is the best one. In the latter years of the war, his physical condition started to deteriorate, and on April 12, 1945, less than three months into his fourth term, Roosevelt passed away.
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