Question ID:PT21 S3 Q21 Passage:A number of seriously interested amateur astronomers have tested the new Exodus refractor telescope. With it, they were able to observe in crisp detail planetary features that were seen only as fuzzy images in their 8-inch (approximately 20-centimeter) Newtonian telescopes, even though the 8-inch telescopes, with their wider apertures, gather more light than the 4-inch (approximately 10-centimeter) Exodus. Given these amateur astronomers’ observational findings, any serious amateur astronomer ought to choose the Exodus if she or he is buying a telescope for planetary observation. Stem:Which one of the following most seriously weakens the argument? Correct Answer Choice:BChoice A:Telescopes of certain types will not perform well unless they have been precisely collimated, a delicate adjustment requiring deftness. Choice B:Image quality is only one of several different factors that, taken together, should determine the choice of a telescope for planetary observation. Choice C:Many serious amateur astronomers have no intention of buying a telescope for planetary observation. Choice D:The comparisons made by the amateur astronomers were based on observations made during several different observation sessions. Choice E:The substance used to make the lenses of Exodus telescopes differs from that used in the lenses of other telescopes.