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Must Be True—SN. The correct answer choice is (E)
This stimulus contains a set of facts, without a conclusion. Interestingly, both causal reasoning and conditional reasoning are at play here.
The facts tell us that although antibiotics are standard ingredients in animal feed that keep animals healthy and increase meat yields. This is a causal relationship:
A = antibiotics
HA = healthy animals
IMY = increased meat yields
- Cause Effect
However, scientists have recommended phasing out antibiotics due to fear their use may make antibiotics less effective in humans. We are warned that some farmers will go out of business if meat yields are reduced, which expresses a conditional relationship:
IMY= meat yields not increased, meaning they are reduced from the prior levels caused by antibiotics
FOB = some farmers will go out of businesses
- Sufficient Necessary
SRI = scientists’ recommendation implemented
- Sufficient Necessary/Sufficient Necessary
SRI IMY FOB
Answer choice (B): This answer choice is incorrect, because it says the antibiotics will become ineffective in humans, while the stimulus only contained the theory that the antibiotics could become less effective.
Answer choice (C): Here, the sufficient condition is that the recommendation is not heeded, but the stimulus does not tell us about what will happen in that event. We only know what will occur if the recommendation is heeded. This answer choice is a Mistaken Negation of the information in the stimulus.
Answer choice (D): The stimulus only discussed the business impact on farmers of reduced meat yield on farmers, and not reduced animal health. This answer choice presents new information not supported by the stimulus.
Answer choice (E): This is the correct answer choice, because it expresses our prephrase, that some farmers will go out of business due to reduced meat yields if the use of antibiotics in the feed is phased out. Do not be thrown off by the inclusion of the “unless” clause. It is consistent with the stimulus to say that if there were some other means of increasing meat yields, then that could prevent the farmers from going out of business because of a reduction in meat yields resulting from the phase out.