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The detail that you've mentioned isn't in answer choice (C), it's in the conclusion of the argument:
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Consumers can make a significant long-term reduction in the amount of waste that goes unrecycled, therefore, by refusing to purchase those products packaged in plastic containers labeled with the highest code numbers.
Here, the author concludes that consumers can reduce landfill waste by refusing to buy high-numbered plastic containers.
(C) undermines this conclusion, because there needs to be a demand for these high-numbered containers in order for lower-numbered plastics to be recycled. For more on why (C) is the correct answer, check out this post.Hi @GMATNinja @KarishmaB @GMATGuruNY @AjiteshArun
I understood why (C) should be the answer, but i still don't understand why (A) is incorrect.
Below is my understanding of (A):
By refusing to purchase those products packaged in plastic containers labeled with the highest code numbers ----> Consumers
can make a significant long-term reduction in the amount of waste that goes unrecycled.
Argument takes a leap from ''By refusing'' to ''making a significant long-term reduction''
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(A) The cost of collecting, sorting, and recycling discarded plastics is currently higher than the cost of manufacturing new plastics from virgin materials.
This option indicates that even If Consumers keep picking the lower numbered plastics, Manufacturers won't recycle those reclyclable plastics because they do not have no financial incentives. I think, this option mocks the big leap between
''By refusing'' and
''Making a significant long-term impact'', by pointing out that JUST by refusing to take the goods, you can't make the impact.
(A) suggests that your plan cannot work, because you have not considered some another factor.