The correct answer is C. Excited
Step-by-step explanation:
In a presentation, the tone refers to the attitude of the speaker, this varies according to the topic presented, the situation, and also the audience. Indeed, the audience is one of the most important elements for the tone because depending on the education, age, preferences, and occupation of the audience the tone should be different. For example, if your audience is doctors your tone should be formal and academic.
In the case of a preschool audience, the best is to use an excited tone because this audience includes very young children, and the speaker will need to catch their attention; also, they do not have a broad or deep knowledge and the situation is likely to be informal. Therefore, by using an excited tone the speaker can catch the attention of the children and deliver the message more effectively. Also, in this case, a serious or professional tone is not adequate.