Explanation
### Why this is right
An index is an alphabetical guide to subjects, names, and terms discussed in a book. Each entry points you to the page or pages where you can find that material, so you can look up a specific topic without reading the book from the beginning.
### The concept
An **index** is usually placed at the end of a book and is organized alphabetically. It helps you locate where a particular subject is discussed, rather than showing the order in which the book presents its chapters. An index may include subentries, which divide a broad topic into smaller subjects, and it may refer you to another related entry. It is different from a table of contents, which lists chapters or sections in reading order, and from a glossary, which gives definitions of selected terms.
### The other options
- **B. Table of contents**: lists chapters and sections, usually in the order they appear, with page numbers. It helps you find a section, not every page where a topic is discussed.
- **C. Glossary**: gives definitions of selected words or terms, usually in alphabetical order. It explains what a term means rather than listing all the pages where it appears.
- **D. Appendix**: contains extra material placed after the main text, such as data, documents, or detailed explanations. It is not an alphabetical page-finding guide.
### Watch out
Both an index and a table of contents can include page numbers, but their organization gives them away: an index is alphabetical by topic, while a table of contents follows the book’s structure.
### Terms
- **Index**: An alphabetical list of topics, names, or terms with page references for finding where they are discussed.
- **Table of contents**: A list of a book’s chapters or sections in their order, usually with starting page numbers.
- **Glossary**: A list of selected terms with their definitions.
- **Appendix**: Extra material added after the main text.
### Remember
Use the index to find a topic, the table of contents to find a section, and the glossary to find a definition.
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