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https://classic.7sage.com/lsat_explanations/lsat-28-section-3-question-21/
hello everyone, this is a question that was asked but there was no clear answer. The answer choice for A, if you take the contraceptive it matches the flaw. Is A only wrong because D just has a better match? if D were not there, would A be correct?
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Hi, @ioana200.lopez - it is never the case that one answer is "more right" than the others. There is always only one right answer, and 4 very wrong answers. This is a general rule that comes in very handy because it changes the way you think about reading answers. Never try to find how an answer (other than the one right one) can, maybe, perhaps be right - focus on confirming what exactly makes it obviously, hopelessly wrong (obvious for LSAT questions is a lot more subtle than real life obvious).
Now, for the question at hand.
The error in the stimulus is an illegal negation.
If it were not legal to litter-->city should provide trash cans.
Inference:
If legal to litter --> city doesn't need to provide trash cans.
So, they take
/A-->B
and infer
A-->/B
For answer A, there's no such illegal reversal. The flaw there is mistaking a necessary for a sufficient
If holiday -->bakery closed
Inference:
If bakery closed-->holiday
If A-->B
wrongly infer
If B-->A
To have A match the flaw in the original stimulus, the inference should have said "but today is not a holiday, therefore the bakery will be open"
Answer D has the same flaw as the original
If flight not on time-->miss meeting
Inference
Flight on time-->not miss meeting
/A-->B
infer
A-->/B