[Deleted because this question is from a banned source - see below.]
Ron, I cannot understand the explanation in OG. Please help me picke up the correct answer, give the reason for your choice, and explain why the rest are wrong. Thanks in advance!
Please read (and follow!) the forum guidelines before posting. OG is a banned source; it is illegal to post OG questions anywhere on the web. If you are in one of our classes, please ask OG questions during office hours or before/after class.