【单选题】

{$mediaurl} 11, Why does the professor say this:

A、To indicate thatDahlonega has changed little in the decades since the gold rush.

B、To provide background details about a city that figured prominently in the gold rush.

C、To emphasize the effect that the gold rush had on the population ofDahlonegA、

D、To suggest that gold rush cities continued to prosper long after the initial rush endeD、