问题详情

Why does the professor say this:
A．To indicate that Dahlonega 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 of Dahlonega.
D．To suggest that gold rush cities continued to prosper long after the initial rush ended.请帮忙给出正确答案和分析，谢谢！