It's seemed like this is a question from your class reading, and well, we can't help you if you don't provide us what is that document.
The answer is number 4) a literary critic's analysis, because it is not written by a student and it is a reliable source compared to a blog, website, or student paper.
I think online education is becoming so popular because they're many people who can't go to school for various reasons; Maybe because of health problems, far house, or maybe just because they wanna stay at home! You can do multiple activities during the school year if you're studying online. And guess what! You can study from ANYWHERE and ANYTIME you want to!
<em>This is what I <u>know</u>, I hope it helps you!</em>
