One of the Drawbacks of the Heckscher-Ohlin Theory Is That

One of the drawbacks of the Heckscher-Ohlin theory is that:

A) it does not explain the differences in national factor endowments.
B) it argues that comparative advantage arises from differences in the countries' labor productivity.
C) it lacks commonsense appeal.
D) it is a relatively poor predictor of real-world international trade patterns.
E) it cannot be subjected to many empirical tests.