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The correct answer is option 1 - persons. The density of population in an area is measured by the number of individuals living in that area. It is determined by dividing the total population of the area by the area`s land area or square footage.
Option 2 - children, refers specifically to the number of children in the population, which may not accurately represent the overall population density.
Option 3 - families, refers to the number of families in the area, which can vary in size and may not provide an accurate measurement of population density.
Option 4 - houses, refers to the number of houses in the area, which may not accurately reflect the number of people living in each house or the overall population density.
It is important to measure population density accurately to understand the distribution and impact of people in a given area.