Teacher:In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Teacher: Now, understand the problem? Solve this instance: [header] How to look refreshed when you wake up [title] Let in natural light. [step] Sunlight, or an artificial alternative, helps your body accept the awakening. Not only will you wake up easier, but you'll reset your body's clock, feel better rested, and improve your mood. <sep> (A) [title] Do some exercise first thing in the morning. [step] Exercise increases body temperature and releases endorphins that help you awaken. (B) [substeps] Set an alarm and let it go off at sometime in the day. Studies have shown that people who select natural sunlight reduce their risk of developing sun-related disorders, such as cirrhosis or cancer. (C) [substeps] Get in the habit of letting in natural light in the morning. Whether you're seeing a movie, taking a walk in the park, or watching a new show, sunlight will keep you energized. (D) [substeps] You don't have to spend every waking moment of the day in the sun. Window exposure seems to be the only positive stimulant for most people.
Student:
A