This GRE question is confounding me. The answer given is A, C, D and E.
First off, if you plug in zero for all of the variables, all of the options are right. I see nothing wrong with saying $|0| = 0$. I also do not understand why B is wrong (or why it is even listed) when it is the exact same expression as the question, and would be correct if all of the variables were set to 1 for example. Why is option B incorrect?