Who and that are Relative pronouns
I suppose A? Maybe cuz you'd want to be able to research anything.. Without limits ya know.. Just my opinion though. Not quite sure.
Answer:
c to capture the readers attention
Explanation:
you need to get the readers interested
in the intro so they will continue to read your essay
Answer:
I think it would be B. it makes it sound more like a paragraph. It's more understandable