13.By law, a qualified physician can only prescribe medicine, protecting the public.
(A) By law, a qualified physician can only prescribe medicine, protecting the public.
(B) By law, only a qualified physician can prescribe medicine, protecting the public.
(C) By law, only a qualified physician can prescribe medicine which protects the public.
(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：E

我想請問A B答案中protecting是犯了哪種錯誤

我看的帖子 有人說是protecting造成歧義 但我不懂為什麼 ???請解一下

B: protect's subject is "physician" which is actually wrong.

Hope it helps.