arushi118
In option E, it still will lead to the conclusion that they are unhappy being divorced right? Why not option B - as atleast sometimes the ones who are divorced will be happier than they would have been if not divorced?
I feel your pain here. (And keep in mind that this isn't an official GMAT question, so I'd take it with a grain of salt.)
Boiled way down, the argument is that unhappily married couples should stay together because the ones who get divorced reported that they were more depressed, post-divorce.
We're looking for an answer that undermines this logic and suggests that maybe people should still get divorced, despite these reports. (B) is certainly tempting -- I held on to it on my first pass.
The key flaw in (B) is the detail in the language, "on occasion." Well, if things are only worse in your marriage,
on occasion, but divorce is going to cause you to get more depressed overall, it still might be worth it to stay in the unhappy marriage.
Contrast this with (E). The whole argument is dependent on the idea that divorced people report being more depressed after they got divorced. But if we can't trust these reports because divorced people, in general, have a distorted view of their depression, we lose the one piece of evidence to support the conclusion.
Is it still
possible that divorced people are more miserable? Sure. But because we've poked holes in the evidence, the logic of the argument falls apart.
Is (E) a perfect answer? Nope. Is it the best of the bunch because it's the only one that undermines the evidence presented? Yep. So (E) it will have to be.
I hope that helps!