Final answer:
The best place for Matt to find information for his world history chapter outline is the index at the end of his history textbook.
Step-by-step explanation:
If Matt was assigned to do an outline of chapter 3 in his world history text, the best place for him to find the information and a short topic guide would be (a) The index at the end of the book. This is because the index is designed to direct readers to the exact pages where specific topics are covered, which can be incredibly useful for creating an outline. Additionally, since the question specifically refers to a historical outline, a world history textbook is pertinent, and the index within it will be most relevant to Matt's assignment.