天山新题 20-13，大家一起来讨论！
By law, a qualified physician can only prescribe medicine, protecting the pubic.
(A) By law, a qualified physician can only prescribe medicine, protecting the pubic.
(B) By law, only a qualified physician can prescribe medicine, protecting the public.
(C) By law, only a qualified physician can prescribe medicine which protect the pubic.
(D) In order to protect the public, by law a qualified physician only can prescribe medicine.
(E) In order to protect the public, by law only a qualified physician can prescribe medicine.
答案是E，怎么判断protect the public是目的？protecting the public如果用来修饰medicine，如B，为何不可？
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