Why is the Library of Congress a useful site to search? (Answer the question with the given paragraph below)

AIt is a subject directory site with links to various categories of information, from art to statistics.
BThe Library of Congress is a huge database with full text articles on many subjects.
CIt is a powerful search engine that allows the user to search "invisible" sites.
DThe Library of Congress is a site that uses nesting to allow for more precise searches.


The Library Of Congress has similar kinds of information and you can see that they highlight their collection in this section here with prints and photographs, newspapers, sound recordings, films, maps and manuscripts of all kinds. It's our government library, basically. Here are the topics that they have information on and a section for kids and for research, in particular.