A survey says that 18% of the young students who will take the high school exam have mental (精神上的、心理上的) problems. Young students should _____ to keep their minds healthy.
① break the winsow when feeling unhappy
② take part in group activities
③ go to see a mental doctor if he or she often feels unhappy
④ talk to parents or teachers often
⑤  shout at people when you have trouble getting on well with them
A. ①③⑤            B. ②③④       C. ②④⑤