[单选题]: Put the following sentences in the right order to form a complete cause-effect paragraph about the topic: The Cause of Smoking for Teenagers. 1. It is not uncommon to see teenagers smoking today. 2. When they see some of their friends smoking, they feel the pressure to try it out in order to “fit in” with the crowd. 3. Some other teenagers smoke because they want to imitate adults or appear to be mature. 4. Some of them smoke because of peer pressure. 5. Teenagers like to imitate their favorite stars and adults around them. 6. So, parents who smoke may set a bad example for their children. 7. In conclusion, the causes of teenager smoking can be attributed to peer pressure and their intention to look like adults. The correct order:________