Answer:
B. Study until bedtime, wake up early, eat breakfast, and walk to school with her best friend
Explanation:
Process of elimination. If she wants to bring her stress level down, then we already know that we can eliminate choice A. Stay up late, drink a lot of coffee, and cram as much of the textbook as possible into her head, because that will cause her a lot of stress, especially during the exam, when she'd be exhausted. So choice A isn't a good selection. Now, we have options B. Study until bedtime, wake up early, eat breakfast, and walk to school with her best friend and C. Study until bedtime, wake up early, and study some more until her mom drives her to school. Well, if she wants to clear her mind of everything and make a good grade, she<em> has to</em> eat breakfast! If we choose C, then she'll skip breakfast, and that's not good for her! So we know that it has to be B.