Comparing Incomes Across Countries Based on Per Capita GNP Figures

Comparing incomes across countries based on per capita GNP figures that have been converted to dollars using the exchange rate

A) is considered to be the best way to compare living standards across countries.
B) is a method of comparison that takes into account unequal distribution of income in a country.
C) accurately reflects differences in purchasing power across countries.
D) may not accurately reflect differences in purchasing power across countries.