Mark A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.Câu hỏi The teachers are very friendly and enthusiastic. I met them at the meeting last Monday. A. The teachers which I met at the meeting last Monday are very friendly and enthusiastic. B. The teachers whom I met them at the meeting last Monday are very friendly and enthusiastic. C. The teachers whose I met at the meeting last Monday are very friendly and enthusiastic. D. The teachers whom I met at the meeting last Monday are very friendly and enthusiastic.