Which of the following displays the location of information in a given book?

Question

Quizplus · Accepted Answer

An index contains information about the location of information in a given book.
An encyclopedia is incorrect. An encyclopedia is a set of books that give information on many topics, or many aspects of one subject. It most likely contains an index, but alone it does not display the location of information in a given book. 
A dictionary is incorrect. A dictionary is a tool used for finding the definition of words. It does not display the location of information in a given book, and is therefore incorrect.
A library online catalog is incorrect. A library online catalog would be consulted for information on finding a given book, but it does not contain information on where to find information in a given book.

Which of the Following Displays the Location of Information in a Given