The Following Figures Show the Demand and Supply of Labor

The following figures show the demand and supply of labor in two different types of labor market. Figure 15.5 In the figures,
D: Demand curve for labor
S: Supply curve of labor
MRP: Marginal revenue product
MFC: Marginal factor cost
The Market B described in Figure 15.5 is a(n) :

A) perfectly competitive labor market.
B) monopolist market.
C) oligopolistic market.
D) monoposonistic market.
E) monopolistically competitive market.