The Labor Demand Curve for an Individual Firm Is

The labor demand curve for an individual firm is:

A) upward sloping because businesses are willing to pay higher wages to hire more workers.
B) downward sloping because the value of labor's productivity falls as more workers are hired.
C) perfectly horizontal because labor's productivity does not change as more workers are hired.
D) downward sloping because workers will supply more hours of labor at lower wage rates than at higher wage rates.