Bunuel
Scientist: There is a finite amount of helium, which is a key component of MRI magnets, in the world. Because the supply is not renewable, it is frivolous to waste this precious resource on such products as party balloons. Instead, we should use other gases, such as hydrogen, to fill balloons, and the price of helium should be raised significantly to make it prohibitive for such trivial purposes.
Which of the following, if true, provides the strongest support for the suggestion that the price of helium should be raised?
(A) Other medical imaging tests exist that do not require helium to function.
(B) Hydrogen is at least as plentiful as helium, and is not a finite resource.
(C) The cost of the helium used for medical purposes is already significantly higher than helium sold on the open market.
(D) A survey of patients has shown that they do not mind paying slightly more for services if doing so helps the environment.
(E) 80% of people who purchase gases for party balloons cite the price of helium as one of their top three considerations in choosing it.
Official Explanation
Answer = (E).
The scientist in this passage has concluded that hydrogen, not helium, should be used to fill balloons, and that helium should be made more expensive. His evidence is the finite supply of helium. To strengthen the link between these ideas, we need to connect consumer use of helium to its low price. (E) does this by suggesting that one of the reasons people use helium for party balloons is its low price.
The scientist is going after frivolous, not medical, uses of helium (A). Furthermore, even if other medical imaging tests exist that do not require helium, look at the evidence the scientist cites: the supply of helium is finite. Identifying other medical imaging tests does not change that fact.
Choice (B) focuses on hydrogen, which is one example cited, but not necessarily the only substitute for helium. The fact that hydrogen is "at least as plentiful" for helium is promising. Does hydrogen have other issues, such as its flammability, that make its use at parties problematic? We don't know, but that's a possibility. Finally, this final line is completely unrealistic: hydrogen is "not a finite resource." What in tarnation does this mean? The entire Visible Universe is finite! What does it mean for a resource not to be finite? Does some divine being continual supply humans with unlimited hydrogen? How does such a resource fit into any known economic system? This last line raises many more questions than it answers. This does not provide strong support because of all the questions this raises.
If medical helium is already more expensive than the helium sold to consumers, (C), this tells us nothing about the finite supply of the gas, only about its price. To provide a strong strengthener, the statement has to connect the finite supply to the price, as in (E).
(D) is vague: to pay slightly more for services doesn’t tell us what people would think about raising the price of helium. It also doesn’t create a connection between the limited supplies of the gas and the possible price hike.