V. Mark the letter A, B, C, or D to indicate the correct response to each of the following exchanges.Câu hỏi Nam: "How important is tourism to our country?" - Lan: “_______________” A. More and more companies are advertising about ecotourism. B. It really helps to create more jobs for a lot of people. C. Tourism is also an industry. D. It is hard to develop without learning about tourism.