I believe the answer is- C!
Have a Warm and Wonderful Day!!
When you study for information you gather information about your topic.
All of a sudden
Next time if you have choices you should include them in your question so it will be easier to help.
You read the book correct? if so just write who they are, What they wanted and if you didn't read the book skim through it and read some paragraphs. What was the problem? Now how did they solve that problem? The book has all the answers.