The Figure Given Below Represents an Imperfectly Competitive Resource Market

The figure given below represents an imperfectly competitive resource market. Here common land (and not land used for specific purpose) is under consideration.Figure 18.1

-The supply curve of land, in the market for uses of land, is:

A) perfectly inelastic.
B) nonexistent.
C) perfectly elastic.
D) positively sloped.
E) negatively sloped.