Answer:
Option C. The following is the statement that best describes the mistake the writer makes in the paragraph:
The writer loses shift to another topic.
Step-by-step explanation:
In the paragraph the writer makes the mistake of shifting to another topic without properly linking it with the first topic being discussed which makes the shift to appear abruptly. Instead of giving more details and additional information about the first topic being discussed, which was the importance of exercising regularly, the author suddenly starts discussing the importance of a balance and healthy diet. Although the two concepts can be put together in a paragraph because they are interconnected, the author did not connect them in a proper and logical manner.