Defining cities based on business services found in each gives the ordered hierarchy of
A) manufacturing centers, military centers, mining centers, and resort, retirement, and residential centers.
B) world cities, command and control centers, specialized producer-service centers, and dependent centers.
C) dominant world cities, major world cities, command and control centers, and secondary world cities.
D) command and control centers, secondary world cities, specialized producer-service centers, and dependent centers.
Answer: B
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