An Individual Firm's Demand Curve for Labor Is

An individual firm's demand curve for labor is:

A) horizontal because there is no relationship between wage rates and the number of workers hired.
B) horizontal because firms can hire as many or as few workers as they wish at the going wage rate.
C) downward sloping because of the decreasing value of labor productivity as more workers are hired.
D) upward sloping because of the need to raise prices in order to pay the wages of additional workers that are hired.