The correct answer is B. A library resource
Step-by-step explanation:
A card catalog is a type of source that contains all the biographical information of the sources found in a library in cards that are used by users of libraries to find books, documents, and materials. This type of source was widely used in libraries before computers were integrated to help users find sources and consisted on multiple cards that were placed on drawers, but nowadays the use of card catalogs is not common except in certain libraries or in sections of them. Considering this, it can be concluded a card catalog is mainly an example of a library source as this are used in a library and contain information about the materials found in it, which are the main features of library resources.