Answer:
B. To inspire Americans to be confident in America's economic future
Explanation:
The main purpose of Franklin Delano Roosevelt's first inaugural address is to inspire Americans to be confident in America's economic future. He was the president in the times when there is great depression in the country which greatly affect the citizens of people. This great depression has a very adverse effect on the American economy so the first inaugural address was done to give hope to the Americans that they should be confident in America's economic future.