Which of the following best explains how fdr introduces the central idea of the speech? a. he reassures the public, introducing his central idea that the united states is not as bad off as everyone thinks. b. he praises the hard work of laborers and business men, then introduces his central idea that with more hard work the economy can be healed. c. he reassures the public, promising candor and decisiveness in his leadership, then introduces his central idea: a plan for promoting prosperity in the face of decline. d. he blames the previous people in government and business, thereby introducing his central idea that the american decline is due to greed and corruption.