When butterfat was considered nutritious and healthful, a law was enacted requiring that manufacturers use the term “imitation butter” to indicate butter whose butterfat content had been diminished through the addition of water. Today, it is known that the high cholesterol content of butterfat makes it harmful to human health. Since the public should be encouraged to eat foods with lower rather than higher butterfat content and since the term “imitation” with its connotations of falsity deters many people from purchasing products so designated, manufactures who wish to give reduced-butterfat butter the more appealing name of “lite butter” should be allowed to do so.
Which one of the following, if true, most seriously undermines the argument?
(A) The manufacturers who prefer to use the word “lite” instead of “imitation” are motivated principally by the financial interest of their stock holders.
(B) The manufacturers who wish to call their product “lite butter” plan to change the composition of the product so that it contains more water than it now does.
(C) Some individuals who need to reduce their intake of cholesterol are not deterred from using the reduced-butterfat product by the negative connotations of the term “imitation.”
(D) Cholesterol is only one of many factors that contribute to the types of health problems with which the consumption of excessive amounts of cholesterol is often associated.
(E) Most people deterred from eating “imitation butter” because of its name choose alternatives with a lower butterfat content than this product has.

E !
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another E

It is as simple as this. E says that most consumers of Imitation butter(IE) with say 70% of butterfat content have shifted to other alternative in market, say X, which has 20% of butterfat content. Now, even if IE changes its name to Lite Butter, most of consumers, who have shifted to X wont come back to Lite Butter, because X has lesser butterfat content. So, changing name wont help IE.

Official Answer- E

Official Explanation follows:
People used to think that butterfat was nutritious and healthful, and at that time a law was passed requiring that butter that had been diluted with water be labeled “imitation butter.” Now, the author says, we know that butterfat is unhealthy, so people should be encouraged to eat foods with lower butterfat content. The term “imitation” deters people from buying diluted butter, so the law should allow this product to be labeled “lite butter,” a more appealing name.

We can weaken this by showing that the author’s solution won’t help the problem, as choice (E) does. (E) explains that the name “imitation butter” provides a service, because people shy away from it and instead buy products with even lower butterfat contents. This is not so good for the imitation butter industry, but it undermines the author’s argument, and so it’s correct. Speaking of the industry, choice (A) tries to explain that the decision to use the word “lite” was motivated by financial greed, but the reason for the decision doesn’t have enough of an effect on the argument to be considered a weakener.
As so often, the motivation behind a plan is not especially relevant to the wisdom of that plan. Choice (B) would have the imitation butter makers watering their butter even more, which might help people eat even less butterfat, which is a good thing, so (B) strengthens the author’s argument, if anything. (C) tells us that some people eat imitation butter despite its name — well, that’s good, but it’s the people who are deterred from it and instead eat real butter that the manufacturers are concerned with. And (D) focuses on the detail of cholesterol in butter and its effects on health, which can’t weaken the argument — just because it’s not the only factor doesn’t mean it’s not an important factor, and it doesn’t mean that the author’s plan won’t work.
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its e
i took fairly long time to reach the answer..
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just one more month for exam...