Which action is known to reduce speeding in teens

Hey there!

The answer would be "peer actions". I saw the multiple choices to this answer elsewhere. 

It can be assumed that "peer actions" are basically other people in that same teenager age group convincing their friends and other peers to avoid speeding, perhaps with personal experiences (for example, a family member was injured in a car accident) or with statistics that they know off hand. Instead of hearing it from adults, which tends not to work since many teens like to feel rebellious and don't listen to their elders, hearing it from their friends can leave a longer-lasting impact. 

If this isn't in your answer choices (I'm assuming that you have them), just let me know and I'd be happy to help you out further. 

Hope this helped you out! :-)