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Determine whether the data set is a population or a sample. Explain your reasoning.
The number of floors in each building in a city.
Choose the correct answer below.

A. Population, because it is a collection of the number of floors for all buildings in the city. 
B. Population, because it is a subset of all buildings in the state. 
C. Sample, because it is a collection of the number of floors for all buildings in the city, but there are more buildings in other cities. 
D. Sample, because it is a collection of the number of floors for some buildings in the city.