Which of the following statements BEST describes the Metzler paradox?

Which of the following statements BEST describes the Metzler paradox? A) Tariffs improve the imposing nation's terms of trade.B) Export subsidies hinder the imposing nation's terms of trade.C) The paradox can happen even when trade terms are not abnormally extremeD) The paradox claims that trade restrictions may perversely increase domestic prices.