Wow, I did everything on this question and got sucked into answer choice E but had no idea to interpret the word "that" the way JY explained it. Are there others words that indicate "and" or sufficiency that are worth knowing? http://7sage.com/lsat_explanations/lsat-62-section-2-question-19/
Just focus on the last sentence and you should be able to get to answer D pretty easily...
At first I was thinking the answer would bank of the "most" overlap in the first sense and thus checked answer C... (given you can only infer "some" from a "most" and "most" overlap) but this wrongly links the last sentence to the items dicussed before the "however"
Thus, the correct answer has to deal with the last sentence, staring with however... you can easily diagram this.
tropical fish + (NOT) exotic birds --> gerbils independently owned pet store --> (NOT) sell gerbils
By linking the two above, you can get:
independently owned pet store --> (NOT) sell gerbils --> (NOT) tropical fish / exotic birds
Comments
At first I was thinking the answer would bank of the "most" overlap in the first sense and thus checked answer C... (given you can only infer "some" from a "most" and "most" overlap) but this wrongly links the last sentence to the items dicussed before the "however"
Thus, the correct answer has to deal with the last sentence, staring with however... you can easily diagram this.
tropical fish + (NOT) exotic birds --> gerbils
independently owned pet store --> (NOT) sell gerbils
By linking the two above, you can get:
independently owned pet store --> (NOT) sell gerbils --> (NOT) tropical fish / exotic birds
The paraphrase of the chain above is answer D!
"but" in this case functions as an "and"
Hope this helps!