从政府制定政策的角度，就材料所反映的问题提出对策建议。要求：有针对性，有条理，切实可行。字数不超过350字。

— I hear you have to run for half an hour every day. 

— Right. It is one of the             in my school. [ ]

A. choices

B. plans

C. hobbies

D. rules