What an awesome finish to the race

Which of these sentences is the correct one?

Make sure the topic of your persuasive essay is not a.something someone else is writing about b.a fact c.something you have written about before

Write an explanation for how to perform some kind of physical activity, such as riding a bike or playing a sport. the explanation should be geared toward someone who has never performed the activity. be sure to explain the steps in the process clearly, organize your ideas appropriately, use text features