B) to demonstrate a lesson about the importance of scientific research
The article focuses on the research done to conclude that the crater formed was due to a meteorite, not a volcano and further goes to mention the other hypotheses drawn from it, such as the craters on the moon. The final few sentences indicate that scientific research is also being done on other events.
B) the pain of exile
because all the men were in exile after being greedy
I would advise that she either goes to her school library or a local library. If that is not possible, she could also ask her parents if they can schedule the visit to another date. She could also go to a friend's house anyway studying with friends is enjoyable and advantageous.