Bunuel
It is mistaken to attribute Zanco's failure; to the publicity about the supposedly inhuman working conditions~in the foreign factories that furnish Zanco with many of its parts. Zanco's failure has more to do with defects in its products than with any boycott on moral grounds. After all, plenty of other companies are supplied by factories with working conditions just as bad as those in Zanco's suppliers, and the public does not hesitate to buy their products.
The argument in the passage is based on which of the following assumptions?
(A) People are unlikely to let moral considerations affect what products they decide to purchase.
(B) People who patronize companies supplied by factories where working conditions are as bad as those of Zanco's suppliers are aware of those conditions.
(C) The working conditions in the factories that supply Zanco with parts are not as bad as has been claimed.
(D) Zanco's sales did not dip sharply after the poor working conditions in its suppliers' factories became known.
(E) The poor quality of Zanco's products is not a result of the working conditions in the foreign factories where its parts are manufactured.
What does the argument tell us?
That there has been publicity about the supposedly inhuman working conditions in Zanco's suppliers foreign factories.
That there are defects in its products.
Many companies are supplied by factories with working conditions just as bad as those in Zanco's suppliers, and the public does not hesitate to buy their products.
Conclusion: Zanco's failure should be attributed to the bad quality of their product, not the moral concern about working conditions.
Because public freely buys products of other companies with similar moral concern, the author is assuming that the moral issue cannot be blamed for Zanco's failure. But here is the thing - Does the public know about these other companies? About the working conditions in their suppliers' factories? We know that there has been bad publicity about Zanco's suppliers so the public knows. But does the public know about other companies?
To say that this moral issue is not at play here, the author needs to assume that the public knows about all companies who are supplied by suppliers with such working conditions in their factories. Only then can the author say that public still buys their products and hence doesn't care about the moral issue.
(B) People who patronize companies supplied by factories where working conditions are as bad as those of Zanco's suppliers are aware of those conditions.
Exactly what we said. We are assuming that people are aware of those conditions and still buy their products.
(E) The poor quality of Zanco's products is not a result of the working conditions in the foreign factories where its parts are manufactured.
We don't need to assume this. The poor quality (which is the same defects in their products) may or may be a result of bad working conditions. The argument doesn't talk about the reason for the poor quality. It talks about the reason for Zanco's failure - whether it is product quality or the moral issue.
If we negate it and say that the poor quality is a result of the bad working conditions, still people could be avoiding Zanco because of the quality issue, not because they found out about the working conditions. Hence negating it doesn't ruin our conclusion.
Answer (B)