We are not surprised at all, because it is very ________ among young people．

We are not surprised at all, because it is very ________ among young people．

A.usual

B.popular

C.common

D.ordinary

答案及解析： C

解析：

本题考查语境中形容词的辨析和应用，根据句子意思，这里指的是“在年轻人中很普遍”，所以C项为正确答案。