다음 밑줄 친 문장이 문법상 맞으면 (A)를 고르고, 밑줄 친 문장이 틀린 경우, 선택지 (B)~(E) 중에 가장 좋은 대안을 고르시오.
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.