American Cities in the Northern United States,such as Chicago,Philadelphia,and Detroit,________________

American cities in the northern United States,such as Chicago,Philadelphia,and Detroit,________________ .

A) have increased their rate of growth dramatically in the past 20 years
B) have always grown rapidly and continue to do so
C) have maintained a steady state population since the 1970s
D) have steadily lost population over the past 100 years
E) grew very rapidly in the 19th and early 20th centuries