B. The visual aid he uses doesn't contribute to his message.
Explanation:
In this case, Davion is presenting a proposal to convince the local city council to build a skate park. He does so by giving a presentation that focuses on most of the things that are important in order to support this policy. However, Davion also displays a picture of a skateboard the whole time. This is not a good strategy, as the picture does not add anything to his argument.
