The comma should go after again, so the answer is D
I think that it would be Unplugging the computer, because you are either
a. you are doing something that would effect the computer
or
b. because you are being more active
??
It is useful because you see everybody's perspective, you compare how one critic saw it, with the way someone else saw it. You get different conclusions, and you bring your own thoughts into this discussion of intellectuals. The correct answer should be a) <span>It allows you to compare information and make sure you're presenting the most correct and useful data.</span>
