The answer to this would be C. The other two would not make sense or fit for the time period. Also c is true, just learned this in history too!
<span>The 0-19 demographic is the cohort that is the majority of the population in the US over the years. This seems to be counter-intuitive, since it is usually thought that there are typically more adults than kids, but it shows that adults are more dispersed in their ages than youth are in the country.</span>
The better the climate ( temperature of weather ) the more people will want to live there. So they come, get a job and increase the economy.
Idk you really need to find it out
