What are some statistics about the extremes of the country size and populations?

The correct answer to this open question is the following.

Some statistics about the extremes of the country's size and populations are the following. The age distribution. This statistic indicates the total number of people regarding gender and age. Another statistic is the Arithmetic density that divides people with total territory. One of the most common is the Census that the federal government does every ten years. Another one is the Crude Bith rate to know the number of babies born in a determined region in a year. The opposite statistic would be the Crude Death rate.

c or d both can be the answer