Answer:
B.20
Explanation:
First you need to know that in order to find population density you must divide the total amount of people in a population, by the amount of land or square miles/kilometers, but it must be squared, which in this case is perfect.
Second, you would set it up as a fraction with 5000/250
Third, you would hopefully calculate that it equals 20
Hence your answer of 20 persons/square mile.