________ scan millions of websites to identify individual webpages that contain a specific word or phrase and then attempt to rank the results from most useful to least useful.

A) General-purpose search engines
B) Category tagging sites
C) Mobile content managers
D) Multipurpose web portals
E) Database sites

General-purpose search engines like Google or Bing are designed to scan and index millions of web pages and provide results based on specific keywords or phrases searched by users. These search engines use complex algorithms to rank the results based on various factors like relevance, popularity, authority, and quality. Hence, they are the best choice for identifying individual web pages that contain a specific word or phrase and rank them in order of usefulness.