CR question. Good methods?

[Jwan622]

Many people suffer an allergic reaction to certain sulfites, including those that are commonly added to wine as preservatives. However, since there are several wine makers who add sulfites to none of the wines they produce, people who would like to drink wine but are allergic to sulfites can drink wines produced by these wine makers without risking an allergic reaction to sulfites.

Which of the following is an assumption on which the argument depends?

A. These wine makers have been able to duplicate the preservative effect produced by adding sulfites by means that do not involve adding any potentially allergenic substances to their wine.
B. Not all forms of sulfite are equally likely to produce the allergic reactions.
C. Wine is the only beverage to which sulfites are commonly added.
D. Apart from sulfites, there are no substances commonly present in wine that give rise to an allergic reaction.
E. Sulfites are not naturally present in the wines produced by these wine makers in amounts large enough to produce an allergic reaction in someone who drinks these wines.


A is wrong because "the argument does not require this because the conclusion does not address allergic reactions to substances other than sulfites"

So, I'm confused as to why A is wrong for the reason that is written. Isn't A wrong because the conclusion is that people should drink wine from wine producers who don't add sulfites, not because the producers are able to replicate the preservative effect. The argument, on the whole, is concerned with why people who have an allergy to sulfites should drink wine from wine producers who don't add sulfites to the wine. The argument has nothing to do with drinking wine because of their preservative effect right, and that's why A is wrong. I'm confused because the explanation as to why A is incorrect talks, not about preservatives being irrelevant but "allergic reactions to substances other than sulfites" being irrelevant.


Any general tips for Cr assumption question?

My method:

1) find the conclusion
2) understand the jump from premises to conclusion
3) fill in the gap

4) It'd be nice to find some methodology for eliminating wrong answer choices faster. I guess the advice here is to remember the argument better and understand exactly how one jumps from premises to conclusion.

[RonPurewal]

Please read the forum rules: read-before-you-post-general-verbal-folder-guidelines-t2718.html

You can't post problems in this folder without giving the original source of the problem -- i.e., the company or author that first produced the problem (= not a forum or other secondhand source).
If you don't know the original source, then i'm sorry, but you can't post the problem here.

This rule applies to MGMAT problems as well. There are over three thousand problems in our database, so we can't possibly recognize all of them.
(This is also the wrong folder for MGMAT problems, which belong in the MGMAT CAT or MGMAT non-CAT folder.)

We'll have to freeze this thread within a week if the original source of the problem is not posted. Thanks.