Some students may feel nervous before the exam, so they should _________to keep away from being nervous.

①talk to people around loudly before the exam

②take a deep breath before entering the classroom

③listen to some music during the exam

④keep their eyes closed for a while to feel relaxed     

⑤tell themselves that they are the best and be confident

A、①②④

B、③④⑤

C、②④⑤