What is the difference between a population and a community?

Multiple choice question.
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A)
A population is made up of all species in an area. A community is made up only of one species.

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B)
A population is made up of only one species. A community is made up of all species in an area.

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C)
A population is made up of all the species and nonliving things in an area. A community is made up of all species in an area.

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D)
The words mean the same thing.