Answer:
An extermination camp was a place to send people to be killed. Most of this happened during Adolf Hitlers rule when he killed millions of Jews. These camps were a fast easy way to exterminate a group of people.
Prior to the Civil war, the West attracted many immigrants because land was cheap and it was seen as the land of opportunity. The correct option among all the options that are given in the question is the first option. There were many forested lands and those when cleared can proved good for cultivation.
Your A and B are the same, so I assume you messed up there.
But the 26th amendment granted the right to vote to American citizens aged eighteen or older, or 18+.