Your friend Gandalf asks if you can give him a ride home for winter break. You agree to the request in part because you know that you will need his help studying for your physics exam. Your agreeing to drive Gandalf home is best explained by

How did the mountains on the oregon trail influence the timing of pioneers’ travels? a.) the pioneers wanted to avoid times when there was snow in the mountains. the pioneers wanted to spend as much time as possible enjoying the mountain scenery. b.) the pioneers crossed the mountains in late fall when the trees were bare and the views were good. c.) the pioneers were rugged people who were not impacted by the terrain they crossed at any time.