Answer:
The correct answer is letter "C": natural resources.
Step-by-step explanation:
Factor endowment refers to the factors of production -land, labor, capital, and entrepreneurship- a nation has available for manufacturing. Countries with more factors of production available tend to be richer than those that do not. Possessing more factor endowments available can also play a key role for countries to establish a comparative advantage compared to other nations.
Therefore, American economist Michael E. Porter (born in 1947) is likely to consider natural resources a basic factor endowment while skilled labor force, for instance, would be considered as an advanced factor of production.