Which of the Following Is (Are)a Difference Between High-Skilled Workers

Multiple Choice

Which of the following is (are) a difference between high-skilled workers and low-skilled workers?
i.High-skilled workers have a higher value of marginal product.
ii.High-skilled workers have incurred lower opportunity costs to acquire their skills.
iii.The demand for high-skilled workers exceeds that for low-skilled workers.

A) i only
B) ii and iii
C) i and ii
D) i and iii
E) i, ii, and iii