Which of the Following Is True of the Theory of Purchasing

Which of the following is true of the theory of purchasing power parity (PPP) ?

A) It suggests that in the long run,exchange rates should move toward levels that would equalize the prices of an identical basket of goods in any two countries.
B) It encourages traders to buy low and sell high,eventually driving different prices for identical products to the same level around the world.
C) It suggests that the price for identical products sold in different countries should be controlled purely by the supply and demand of those goods.
D) It increases the disparity of prices for identical products from different countries.