When We Use PPP We Can Make Valid International Comparisons

When we use PPP we can make valid international comparisons of real GDP because we

A) calculate the value of goods and services produced in two countries using the same quantities.
B) use data provided by the IMF.
C) use the price data provided by the two countries but not the quantities.
D) calculate the value of goods and services produced in two countries using the same prices.
E) use official government data.