Which of the following is not a possible source of bias for the Leontief paradox?

Question

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The Leontief paradox refers to the unexpected result that the United States, which was then the most capital-abundant country in the world, had a lower capital-labor ratio in its exports than in its imports. This result was not due to Leontief's use of a two-factor model (A) or his failure to consider natural resources (B). Similarly, the fact that Leontief only used physical capital in the measure of capital (C) may have contributed to the bias, as this neglects the role of human capital, but it does not make the result impossible. Therefore, the only choice that is not a possible source of bias is (D), as Leontief did not use Human Capital as an alternative to physical capital in his analysis.

Which of the Following Is Not a Possible Source of Bias