Rethinking a topic from a number of different perspectives is a good way to . a. outline your speech b. stimulate productive thinking c. use presentational aids d. develop the speech introduction

b. stimulate productive thinking

Explanation:

Productive thinking  refers to looking thoughfully at something from a number of different perspectives, so that one is able to choose the viewpoints that are most appropriate for the audience. Thus, reconsidering a topic can trigger distinct outlooks regarding a topic.

The rest of the alternatives are incorrect because outlining a speech involves a general description or plan, using presentational aids deals with the materials used to illustrate the presentation, and developing the speech introduction has to do with the elaboration and production of the information that will be given in the speech.