The main difference between a monopsonist and a competitive buyer of labor is that

A) the monopsonist can hire as many workers as it wants at the going wage while the competitive firm must raise wages to hire additional workers.
B) the competitive firm can hire as many workers as it wants at the going wage while the monopsonist can hire more workers at lower wages.
C) the competitor can hire as many workers as it wants at the going wage while the monopsonist must raise wages to hire additional workers.
D) the monopsonist can force wages down and still hire as many workers as it wants while the competitive firm must increase the wage rate to hire additional workers.