Answer: The right answer is the D: Encyclopedias may be out-of-date if the latest version is not available on the shelves.
Explanation: Encyclopedias do contain up-to-date information, since they are regularly edited and enriched with new data. For that reason, if a library does not have the last edition, or one of the last editions of a specific encyclopedia, the user may find that some of the information is not up-to-date. In the last years, due to the increase and dominance of digital publications, several renowned encyclopedias, such as the prestigious Encyclopedia Britannica, have stopped publishing their printed editions and are offering, instead, digital versions that are available online - and which can be even accessed through an app on the phone.