Which of the Following Is Referred to as the Purchasing

Which of the following is referred to as the purchasing power parity puzzle?

A) Reduced levels of inflation in countries where the growth in the money supply is faster than the growth in its output.
B) The reason why countries with high inflation rates see depreciation in their currency exchange rates.
C) Identical products being sold in different countries for the same price when their price is expressed in terms of the same currency.
D) The failure to find a strong link between relative inflation rates and exchange rate movements.