Answer:
The topic that is an example of a persuasive speech is "why our city needs better public transportation"
Explanation:
The purpose of the persuasive speech is to convince the audience of the idea that is being presented by the speaker through the development and presentation of supporting details during the speech, the only topic from the given options that could be presented in this way is "why our city needs better public transportation" since it will give reasons to convince people to agree in this necessity.