Assume That This Graph Illustrates a Perfectly Competitive Labor Market

Assume that this graph illustrates a perfectly competitive labor market.
In this market,at a wage of $40,

A) the market would be in equilibrium.
B) there would be more people wanting to work than there would be job openings at firms.
C) firms would not be able to find enough workers to satisfy the firms' demand for workers.
D) approximately 175 worker hours would be hired.