When the audience actively participates in your speech, they

Jessi is preparing a speech to acquaint listeners with the role of citizens in her

hometown who combat litter by participating in "Clean-Up-the-Parks Day" and "Adopta-Roadway". Jessi is a long-time volunteer herself, and she has numerous stories—some humorous—about the endeavors, as well as startling statistics and other material that could be considered highly "attention-capturing." What should she do with this material? A) Select the best one of these and use it in the introduction as an attention-getter. B) Use one to grab attention in the introduction, and another to enhance the conclusion. C) Use many of them, in combination and in varying ways throughout the speech. D) Avoid using humorous stories about cleanup, since the topic is a serious one.

What were Lee DeForest's contributions to the development of radio?

What will be an ideal response?