- Tue Jun 25, 2019 5:56 pm
#65806
Hi LSAC Gals,
I'm going to answer your questions in reverse order:
"If" is a sufficient condition indicator, unless it is paired with "only" as "only if," in which case the "only" makes it a necessary condition indicator. Biconditional relationships (the conditions being both sufficient and necessary for each other) will almost always be indicated by "if and only if," as that contains both the sufficient and necessary indicators.
"Since" is a premise indicator that also implies a causal relationship, basically synonymous with "because." The causal relationship may or may be pertinent to answering the question, but the premise indication is very helpful in identifying a conclusion that will either immediately follow or immediately precede the clause attached to the "since." Just remember that this might be an intermediate, not main, conclusion!
As to this particular question, all Strengthen/Justify/Assumption questions contain some form of logical gap flaw. In order to Prephrase them correctly, you first need to identify that gap and what needs to fill it. In this stimulus, the conclusion jumps to an assumed moral obligation that isn't mentioned anywhere in the premises, whose emphasis on legality is a hint that we're dealing with two separate things: moral obligations versus legal ones. So the gap in the stimulus's logic is that they're assuming that owners have a moral obligation to make buyers aware of the owners' legal obligations, at least in cases where the buyers are likely to make certain assumptions about what is included in the sale. My Prephrase was essentially "Whenever buyers are likely to assume something will be included in a sale, the owners are morally obligated to let them know what will be included in actual fact."
Answer choice (A) lines up perfectly with this Prephrase, making it correct. (B) does a subtle bait-and-switch, where it makes sellers morally obligated to not allow buyers to make any assumptions in the first place; however, the stimulus is trying to make buyers morally obligated to correct the assumptions, not ensure that they aren't ever made. So (B) is basically acting as a premise for an entirely different argument than the one being made in the stimulus.
Hope this clears things up!