Here's the OE from Kaplan 800: You have to make a comparison between early medieval monasteries and modern libraries, while also taking into account a modifier for those early medieval monasteries. The modifier, "while clearly less accessible to outsiders," must come directly next to early medieval monasteries, so (B) and (D) are out. Additionally, in (B), it's not clear what they refers to. Now, of the remaining options, (A), (C), and (E), which phrasing works best-like modern libraries or as does the modern library7 The second option is incorrect, as in choice (C); libraries needs to be plural in order to parallel monasteries. And finally, eliminate (E) because acted like modern libraries act is wordier and clumsier than like modern libraries. (A) is the correct answer.