In Order to See How the Labor Market Works as a Whole

In order to see how the labor market works as a whole, we must:

A) add up all the supply curves of individual workers and the demand curves of individual firms to find market level supply and demand.
B) sum the observed equilibrium wages across all individual markets and take the weighted average.
C) add up all the demand curves of individual workers and the supply curves of individual firms to find market level demand and supply.
D) None of these are true.