Answer:
4. 13 students prefer free time at the beginning of class, and 17 students prefer free time at the end of class.
Explanation:
The ratio 13 over 17 represents that 13 students prefer free time at the beginning of class, and 17 students prefer free time at the end of class. So, the correct answer is:
4. 13 students prefer free time at the beginning of class, and 17 students prefer free time at the end of class.