Answer: Option (C) is correct.
Explanation:
The Heckscher-Ohlin theory is based on the cause of comparative advantage and explains that it is the difference in the factor endowments among the countries that is the main cause of international trade.
Heckscher-Ohlin theory says that a country exports the commodity whose production requires the intensive use of nation's relatively abundant and cheap factor and a country imports the commodity whose production requires intensive use of nation's relatively scarce and expensive factor.