The Table Below Shows the Quantity Demanded (In Thousands) and Quantity

The table below shows the quantity demanded (in thousands) and quantity supplied (in thousands) of computers in the U.S. and Canada at different prices.Table 20.5

-According to the Ricardian model, the source of comparative advantage is:

A) differences in labor productivity in different countries.
B) differences in foreign trade policies followed by the government of various countries.
C) differences in resource endowments of an economy.
D) differences in the fields of research and development in a country.
E) differences in the taste and preferences of the consumers in different countries.