다음 밑줄 친 문장이 문법상 맞으면 (A)를 고르고, 밑줄 친 문장이 틀린 경우, 선택지 (B)~(E) 중에 가장 좋은 대안을 고르시오.
Curare has little effect when ingested, but few people are known to recover from its effects when the poison is introduced directly into the bloodstream.
(A) but few people are known to recover from its effects
(B) but few people are known to have recovered from its effects
(C) but its effects are known to allow few people to recover
(D) and few people are known to recover from its effects
(E) since few people are known to recover from its effects