A Human Population with a Large Percentage of Pre-Reproductive Individuals

A human population with a large percentage of pre-reproductive individuals is common in

A) less-developed countries and will most likely increase in size.
B) more-developed countries and will most likely increase in size.
C) less-developed countries and will most likely decrease in size.
D) more-developed countries and will most likely decrease in size.
E) more-developed countries and will not effect the population size.