다음 밑줄 친 문장이 문법상 맞으면 (A)를 고르고, 밑줄 친 문장이 틀린 경우, 선택지 (B)~(E) 중에 가장 좋은 대안을 고르시오.
Ballet dancers warm up before each performance by doing pliés and stretching exercises, and it reduces the chance of injury.
(A) exercises, and it reduces
(B) exercises, which reduces
(C) exercises, reducing
(D) exercises; the routine reduces
(E) exercises, so the routine reduces