The Dollar of the United States Became the Postwar World's

The dollar of the United States became the postwar world's key currency because of all EXCEPT

A) the early convertibility of the U.S. dollar in 1945.
B) the special position of the dollar under the Bretton Woods system.
C) the strength of the American economy relative to the devastated economies of Europe and Japan.
D) central banks naturally found it advantageous to hold their international reserves in the form of interest-bearing dollar assets.
E) the ease of transporting U.S. dollars compared with other currencies.