THe second sentence is using present participle because you said " I promise" not "promised". Saying promise is when you are saying it at the time and saying promised means you've already said it. Like with how you said "kissed" instead of "kiss" in the first sentence.
Answer: I haven't read the book so please take this with a grain of salt but I believe the answer would be C, "As teenagers get older, parents should help them avoid more serious negative consequences." Exerting control might be too much, letting the teenager be too rebellious would lead to disobeyment, and letting them do it again isn't a good idea. I apologize if you get the answer wrong, good luck!
because it is harmful to health, especially in young people, and people under the age of 18 still do not have the authorization to harm themselves.
I wanna say all of the above, because they could all be "fine art".