Which of the Following Is a Reason Why the Wage

Which of the following is a reason why the wage rate of high- skilled workers exceeds the wage rate of low- skilled workers?

A) Low- skilled workers often are in the process of acquiring more human capital.
B) The demand for high- skilled workers exceeds the demand for low- skilled workers.
C) The market for high- skilled workers is more competitive than the market for low- skilled labour.
D) The number of high- skilled workers exceeds the number of low- skilled workers.