Companies delivering mixed concrete know that it cannot be shipped farther than twenty-five miles because the concrete might harden in the truck. Citrus County Concrete Company is the only supplier of mixed concrete to customers within a thirty-mile radius. Citrus County Concrete is an example of which one of the following competitive structures?
A) Monopoly
B) Oligopoly
C) Monopolistic competition
D) Pure competition
E) Monopsony
Answer: A) Monopoly