Read the sentences from the passage. Some may argue that learning another language is difficult, and they are probably right. But there are more advantages that make the effort worth it. Why does the author include these sentences? A. to suggest that not everyone has the ability of learning to speak another language B. to show that learning another language requires hard work and determination C. to persuade others that the benefits of learning another language is job security D. to address an opposing view about the benefits of learning another language