Which of the following could be a topic for a persuasive speech?
a. why seat belts should be mandatory in all states
b. making the most of your summer vacation
c. how to plant a garden
d. remembering funny moments in a coach’s career

First off, a persuasive speech is a speech trying to convince the readers to agree with his/her speech. So your answer has to be A. 

Why seat belts should be mandatory in all states is the answer because it obviously is trying to convince others that seat belts should be mandatory in all states. 

Hope I helped. :)

What does that mean

The correct answer is c. maybe