Choose the sentence (A, B, C or D) that is closest in meaning to the root sentence. Câu hỏi Phong works very hard. He doesn't earn much money. A. Although Phong works very hard, he doesn't earn much money. B. Phong doesn't earn much money because he works very hard. C. Phong works very hard, and he doesn't earn much money. D. So Phong works very hard, he doesn't earn much money.