The Cost of Acquiring a Skill Accounts for Why the

The cost of acquiring a skill accounts for why the

A) supply of high-skilled workers is different to the supply of low-skilled workers.
B) demand for high-skilled workers is different to the supply of low-skilled workers.
C) demand for high-skilled workers is different to the demand for low-skilled workers.
D) demand for high-skilled workers is different to the supply of high-skilled workers.
E) supply curves of high-skilled and low-skilled workers cross.