$12.$ According to our textbook, what is the true nature of real estate in the U$.$S$.?$

A$.$ The U$.$S$.$ is famous for its government$-$managed real estate market.

B$.$ The U$.$S$.$ is famous for its standardized national marketplace.

C$.$ The U$.$S$.$ is made up of tens of thousands of unique local real estate markets.

D$.$ The U$.$S$.$ real estate market is not really that different across the $50$ states