This question asks you to identify which answer choice is inconsistent with the principle stated. So, to begin, it's important to identify the principle. Here, we have:
Society shouldn't restrict adult behavior unless it will prevent a negative effect on others.
Answer (A) is incorrect because it is irrelevant. The editorial is discussing adult behavior while this answer choice is about student behavior.
Answer (B) is incorrect because it is consistent with the principle stated. It says that certain behavior shouldn't be restricted because it won't hurt other people, this is in line with the stimulus.
Answer (C) is incorrect because it is consistent with the principle stated. It tells us that certain behavior shouldn't be restricted, even though it may harm others, because there other ways to eliminate this harm. So, essentially it says that certain behavior shouldn't be restricted because there are ways to eliminate this harm, this is in line with the stimulus.
Answer (D) is incorrect because it says that certain behavior should be restricted because it will hurt others. This is consistent with the principle.
Answer (E) is correct because it is the only answer choice that is inconsistent with the principle stated. It tells us that consuming harmful substances should be illegal because adults tend to ignore warning labels. This is inconsistent with the principle because the principle is about negative effects to others rather than the negative effects to the person doing the behavior.