Which type of restriction on quantity of imports is the most transparent?

Which type of restriction on quantity of imports is the most transparent?
 
  A) Quota
  B) Licensing requirements
  C) Voluntary export restraints
  D) Government procurement policies

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Question 2 - Many of the important international governmental institutions that deal with the global economy have their roots in the Bretton Woods conference at the end of World War II.
 
  Indicate whether the statement is true or false

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Question 3 - The recent trend internationally has been for the executive and legislative branches of elected governments to get more control over monetary policy, as has been the case in countries such as the United States.
 
  Indicate whether the statement is true or false