Hello there!
Your question asks which answer choice is a factor that is responsible for determining population growth
Answer: B). average number of people in a given area
The reason why "B). average number of people in a given area" is the correct answer because this is a factor that helps determine the population growth.
When experts find the amount of people in a given area, they can find how much the population grew in that area. They can also go to other areas and find the average number of people there and find how much the population grew.
They then could add up all of the growths in order to find the grand total of how much the population grew in all the areas combined.
By doing this, it makes experts jobs more easier and efficient to find the population growth.
I hope this helps!
Best regards,
MasterInvestor