Mark the letter A, B, C, or D to indicate the sentence that is best written from the words/ phrases given.Câu hỏi fall off / ladder / if / not careful. A. You will fall off a ladder if you won't be careful. B. You certainly fall off the ladder if you are not careful. C. You may fall off the ladder if you are not careful. D. You should fall off the ladder if you are not careful.