Which of the following statements is an effective specific purpose for a speech?

The statement "At the end of my speech, the audience will understand the benefits of recycling" is an effective specific purpose for a speech because it clearly outlines a measurable and achievable outcome for the audience. It not only communicates the topic of the speech—recycling—but also specifies what the audience is expected to gain from it. By using the phrase "at the end of my speech," it indicates a clear endpoint and provides a focus for the speech's content. This kind of specificity helps guide the speaker in structuring their message, ensuring that they remain on track to achieve the intended goal of informing the audience.

In contrast, while highlighting the effects of pollution and encouraging greener practices are important topics, they lack the specificity needed to define a clear and measurable outcome. Similarly, informing the audience about the history of recycling, while it provides some direction, does not articulate what the audience will retain or how it will benefit them, which is crucial for setting a specific purpose in a speech.