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Which may agree with the findings of the study?

A．Teens' amount of screen time is limited.

B．Depression is related to social media use.

C．It is not easy to tell reasons for depression.

D．Social media use contributes to mental health.

答案：B　细节理解题。根据文章第四段倒数第二句“One of their main findings was that higher amounts of social media use were associated with higher levels of depression. (他们的主要发现之一是，使用社交媒体的次数越多，抑郁症的程度越高。)”可知，使用社交媒体的频率与抑郁症程度相关。故选B。