If Currencies Around the World Are Based on the Gold

Multiple Choice

If currencies around the world are based on the gold standard,and the EU lowers the amount of gold for which the euro will trade,then holding all else constant,

A) the euro will depreciate against the dollar.
B) the euro will appreciate against the dollar.
C) the value of the euro relative to the dollar will stay constant.
D) the value of U.S.exports to EU countries in terms of the euro will decrease.