The best sentence that reflects the central idea of Franklin D. Roosevelt's speech is:
b. "Our greatest primary task is to put people to work ... It can be accomplished in part by direct recruiting by the Government itself, treating the task as we would treat the emergency of a war, but at the same time, through this employment, accomplishing greatly needed projects to stimulate and reorganize the use of our natural resources."
This sentence highlights the central idea of the speech, which is the importance of addressing unemployment and putting people to work through government intervention and the implementation of projects to stimulate the economy and utilize natural resources effectively.

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