Which of the Following Is an Example of Retroactive,informal Social

Which of the following is an example of retroactive,informal social control?

A) teaching your children to "just say no" to drugs
B) your physician writes you a prescription for anti-depressants
C) a class that teachers kids about safer sex
D) taking away your teenager's car keys for one week when she misses her curfew
E) weighing yourself once a week to ensure that you haven't gained any weight