Final answer:
Drug education in schools is a primary prevention measure for drug abuse, proactively educating students about drug risks and effects to prevent initiation.
Step-by-step explanation:
An example of a primary prevention measure for drug abuse is C) Drug education in schools. Primary prevention strategies are proactive measures taken to prevent the occurrence of an issue before it happens, such as educating young people about the risks and effects of drug use to deter initiation. Drug education programs, such as the Drug Abuse Resistance Education (D.A.R.E.), aim to teach students about the dangers of drug use and to develop skills to resist peer pressure and make healthy choices.