Which of the Following Statements Is True

Which of the following statements is true?

A) Speculators do irreparable harm in general to the foreign exchange market.
B) Speculators help make the foreign currency market more liquid and more efficient.
C) Speculators help make the foreign currency market less liquid and less efficient.
D) Governments that attempt to maintain a fixed exchange rate must generally intervene less frequently than those that have floating exchange rates.