The correct answer is A) Re-financing Haiti’s national debt.
The action that characterized the foreign policy of Dollar diplomacy was the re-financing Haiti’s national debt.
Dollar diplomacy is a United States foreign policy that was an idea of President William H. Taft. He considered that in order to maintain political stability in a region where the U.S. had economic and political interests, the American Government should expand the protect and increase the trade with that region. The Dollar diplomacy policy was applied succesfully in the Caribbean and Central America. That is why is correct the affirmation that the action that characterized the foreign policy of Dollar diplomacy was the re-financing Haiti’s national debt.