The Reason(s) American Banks and Other American Financial Institutions Dominate

The reason(s) American banks and other American financial institutions dominate the top ten of the world's largest banks and financial institutions is that:

A) America is the world's largest economy
B) American savers are the thriftiest among the developed world
C) America invented international banking
D) All of the above
E) None of the above, the statement is untrue