Which One of the Following Is Not a Reason Why

Which one of the following is not a reason why the wages of high-skilled workers exceed the wages of low-skilled workers?

A) The market for high-skilled workers is more competitive than the market for low-skilled labour.
B) The value of marginal product of high-skilled workers is greater than that of low-skilled workers.
C) The cost of obtaining the human capital required for high-skilled workers is greater than the cost of obtaining the human capital required for low-skilled workers.
D) High-skilled workers have acquired more human capital than low-skilled workers.
E) The demand curve for high-skilled workers lies to the right of the demand curve for low-skilled workers.