The "Trilemma" Concept Refers to the Fact That a Nation

The "trilemma" concept refers to the fact that a nation may simultaneously select a combination of any two, but not all three, of the following:

A) a managed, dirty float for the exchange rate; a non-independent monetary policy; closure of domestic markets to financial capital flows.
B) flexible bilateral and cross exchange rates; independent, discretionary foreign exchange market interventions; open, liberalized markets for cross-border trade of merchandise and services.
C) fixed bilateral and cross exchange rates; non-independent foreign exchange market interventions; closure of markets to cross-border trade of merchandise and services.
D) fixed exchange rates; an independent, discretionary monetary policy; open, liberalized markets for financial capital.