Youth is not a matter of time but a matter of self-improvement, both physically and morally. Being a good youth, one should have those factors : the basic one is health. A healthy body is a kind of priceless treasure. One can do nothing without it. Secondly, we should pay essential attention to our moral character. We should be always willing to help those in trouble without any complaints. Moreover, we should care more about the people around us. Thirdly, cooperation and communication also play an important role in being a good youth. No one can live alone without any friends. And nobody can work out every problem without help of partners.So the youth should and must learn how to live and work well with others, including those people you don' t like to cooperate or communicate with. The last but not the least, patriotism, meaning a love of one' s country, is the one we should never forget. People always misunderstand the word "patriots" by thinking it only refers to those fighters who fight for their country. As a matter of fact, a patriot will do the things his country asks him to do. So being a youth is one thing, being a good one really needs to take every effort to make yourself to be.
From the passage, we can know that cooperation and communication are ____.

A.good for some introverts

B.helpful to us

C.important to everyone

D.not necessary to good friends