Whether you're having problems with your homework or you're preparing for your term paper, these student-focused websites can help you with anything you need. The key to getting the most out of these online resources is to know how they can best be used to your advantage.  Facebook Although Facebook can be one of your biggest time-wasters and distractions when you are supposed to be getting work done, it can also be one of your most valuable resources. Most of your classmates will probably have a Facebook account, so anyone you need to connect with about a class you missed or about a problem is usually just a few clicks away.  SparkNotes With a free library of history timeline, philosophy study guides and library summaries, and essays, SparkNotes has covered just about any reading-related jam you find yourself in, just run a search for the book, play, or short summary of the material you are supposed to read.  Amazon.com Do you finish every term with many expensive textbooks you will never open again? Instead of letting the money spent go to waste, get back some of your cash by selling your books on Amazon. Wikipedia While Wikipedia isn't aimed specifically at students, it is difficult to think of another website that does more to reduce the pain of paper writing and researching. Wikipcdia gives you a quick way to find sources and get the details of almost any topic you need to research-----all without walking to the library. The passage was mainly written to   _  .
explain some websites for parents compare some educational websites introduce different parts of a website offer some websites that may help students
Question: Whether you're having problems with your homework or you're preparing for your term paper, these student-focused websites can help you with anything you need. The key to getting the most out of these online resources is to know how they can best be used to your advantage.  Facebook Although Facebook can be one of your biggest time-wasters and distractions when you are supposed to be getting work done, it can also be one of your most valuable resources. Most of your classmates will probably have a Facebook account, so anyone you need to connect with about a class you missed or about a problem is usually just a few clicks away.  SparkNotes With a free library of history timeline, philosophy study guides and library summaries, and essays, SparkNotes has covered just about any reading-related jam you find yourself in, just run a search for the book, play, or short summary of the material you are supposed to read.  Amazon.com Do you finish every term with many expensive textbooks you will never open again? Instead of letting the money spent go to waste, get back some of your cash by selling your books on Amazon. Wikipedia While Wikipedia isn't aimed specifically at students, it is difficult to think of another website that does more to reduce the pain of paper writing and researching. Wikipcdia gives you a quick way to find sources and get the details of almost any topic you need to research-----all without walking to the library. The passage was mainly written to   _  .
A. explain some websites for parents
B. compare some educational websites
C. introduce different parts of a website
D. offer some websites that may help students
Answer: