To persuade because you’re trying to convince someone to do something.
The key word in this prompt is convince :)
The statement which best describes the mistake the writer makes in the paragraph is the following one:
The writer loses focus and shifts to another topic.
He starts off by pointing out the overall benefits of exercising, and supports his idea by also giving examples of activities people should engage in. However, focus is lost when the writer begins to address the importance of a balanced diet to the body. That would require a new paragraph.
