Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences given.Câu hỏi Visitors can explore the caves and grottos when coming to the site. They can enjoy mountain climbing. A. When coming to the site, visitors can enjoy mountain climbing but have no chance to explore the caves and grottos. B. As there are too many visitors, the site only offers exploring caves and grottos not mountain climbing. C. When coming to the site, in addition to exploring the caves and grottos, visitors can also enjoy mountain climbing. D. When coming to the site, visitors can neither enjoy mountain climbing nor explore the caves and grottos.