What Does the Following Quotation Mean: "The United States Was

What does the following quotation mean: "The United States was born in the country and moved to the city"?

A) The United States started out as a small country, but became extremely populated over time.
B) Most Americans were uncomfortable with living in large cities until the nineteenth century.
C) The size of the country grew exponentially larger once people started living in cities.
D) Most Americans preferred living in rural areas, but were forced to move to cities because that is where most jobs were located.
E) The United States was at first a rural country and then became much more urban over time.