What Is the Most Accurate Description of Skilled and Unskilled

What is the most accurate description of skilled and unskilled workers if labor supply curves are not perfectly inelastic (perfectly vertical) ?

A) If the two types are complements, then the increases in immigration during the late 1800s would have increased the quantity and wages of skilled workers and decreased the wages of unskilled workers.
B) If the two types are substitutes, then the increases in immigration during the late 1800s would have increased the quantity and wages of skilled workers and decreased the wages of unskilled workers.
C) If the two types are complements, then the increases in immigration during the late 1800s would have increased wages of skilled workers, decreased the number of skilled workers, and decreased the wages of unskilled workers.