I know a little bit about the city as I ______ there for one year in my youth. [ ]

A. am studying

B. had studied

C. studied

D. have studied

一位母亲说：“一提起我那孩子，心中就隐隐作痛，自他上初三后心思就不放在学习上，学习成绩下降，却喜欢与同学攀比，穿名牌服装，尽管平时总是教育他要学习，要节俭，可他就是不听……”

作为同龄的你，请运用所学知识帮助这位母亲劝说她的儿子。

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