The ________ Distance Between the Supply Curve of Low-Skilled Labor

The ________ distance between the supply curve of low-skilled labor and the supply curve of high-skilled labor is the ________.

A) horizontal; value of marginal product of skill
B) horizontal; compensation for cost of acquiring skill
C) vertical; value of marginal product of skill
D) vertical; compensation for cost of acquiring skill
E) vertical; difference in the price of the product produced b y high-skilled labor minus the price of the product produced by low-skilled labor