Do students have to complete the course at one time?

Answer: B — No, they can come back whenever they want

While the other options may seem plausible, they are all limiting in some way. Option A suggests that the course must be completed in one sitting, which is not always possible or practical for students. Option C states that it can be completed in a week, but this may not work for students with busy schedules or other commitments. Option D specifies only weekends, which is once again restrictive. Option B allows students to complete the course at their own pace, making it the correct answer.