다음 글의 빈칸에 들어갈 말로 가장 적절한 것은?

 Getting enough sleep is important for your health. When you don't sleep well, you may feel tired and have trouble focusing. Studies show that people who sleep less than 6 hours a night are more likely to _______.

A. feel more energetic

B. get sick more often

C. perform better at work

D. need less food


사이트에선 제일 어려운 문제긴 했는데. 난이도를 모르겠네