Why would a writer include an appendix,index,or bibliography in a report or proposal?

A) To illustrate key concepts in the message
B) To call attention to particularly important illustrations
C) To provide the purpose and scope of the report
D) The material may be of interest,but isn't crucial to the message
E) As a mini report for those who don't have time to read the entire message

Including an appendix, index, or bibliography allows the writer to provide additional information, sources, or references for readers who may be interested, but the material is not crucial to the main message.

Note: None of the options provided fully captures the most commonly accepted reasons for including these elements, which are:
- Appendix: additional information, data, or details that are too lengthy, technical, or tangential to include in the main body of the report, but may be useful to some readers who want to explore the topic further.
- Index: a list of keywords, topics, or people mentioned in the report, along with the pages where they can be found, to help readers navigate the document and find specific information quickly.
- Bibliography: a list of all the sources (books, articles, reports, websites, etc.) consulted or cited in the report, presented in a standardized format, to give credit to the authors, provide evidence for the claims made, and allow readers to follow up on the references if they wish.