However, before World War II came along and revolutionized all political and economic formulas, none of FDR’s exertions managed to drop the unemployment rate below 14 percent.

Which of the following can be inferred from the selection above?

(A) FDR's attempts to end the Great Depression were a complete failure.
(B) Despite the changes FDR made, he could not totally end the Great Depression.
(C) FDR made key mistakes in his attempt to dramatically change the government.
(D) FDR did not make a strong enough effort to end the Great Depression.