Which of the following sentences is punctuated correctly?

Most of Alaska averages a population density, of under, 3 people per square, mile

Most of Alaska averages a population density of under 3 people per square mile.

Most of Alaska, averages a population density, of under 3 people per square mile.

Most of Alaska averages, a population, density of under 3 people per square mile

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Most of Alaska averages a population density of under 3 people per square mile.
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i dont get the question
what sentence has the correct punctuation