Early medieval monasterries, (while clearly less accessible to outsiders, often served as repositories for texts like modern libraries).
A. while clearly less accessible to outsiders, often served as repositories for texts like modern libraries
B. like modern libraries, often served as text repositories, though they were clearly less accessible to outsiders
C. while clearly less accessible to outsiders, often served as repositories for texts as does the modern library
D. like modern libraries, while clearly less accessible to outsiders, often served as repositories for texts
E. while clearly less accessible to outsiders, acted like modern libraries act by serving as repositories for texts