Can you give some Context
I believe C is the answer
The E.P.A. has power tompunish business through fines and sanctions.
I believe the answer is: causality.
The initial assumption above is that a teenager who use drugs would most likely influence other non-users to use drug. There is nothing from the finding that disprove otherwise. So, when user hang out with non-users, there is a pretty good chance that the non-users could influence the users to stop consuming the drug.
