Which of the Following Statements Is Not True About Search

Which of the following statements is not true about search engines?

A) They are arguably the Internet's "killer app."
B) They have solved the problem of how users instantly find information on the Internet.
C) They are monetized almost exclusively by search engine marketing.
D) They emerged in the early 1990s as simple software programs.
E) There are hundreds of search engines vying for user attention, with no clear leader having yet emerged.