Ho Chi Minh City is the most crowded city in Vietnam.

A. Ho Chi Minh City is not so crowded as all the other cities in Vietnam.

B. Ho Chi Minh City is more crowded than all the other cities in Vietnam.

C. All the other cities in Vietnam are more crowded than Ho Chi Minh City.

D. Ho Chi Minh City is as crowded as all the other cities in Vietnam.

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