Which statement about the effect of drugs on driving is true?

• A. No drugs have an effect
• B. Some drugs have no effect
• C. All drugs have an effect
• D. Drug effects only occur with alcohol

Answer: (C)

Drugs can change the abilities you need to drive, such as reaction time, alertness, coordination, and judgment. Because of that, virtually every drug has some potential to affect driving—whether it's a prescription medicine, an over-the-counter remedy, or an illegal substance. Even if you don’t feel noticeably different, the effect can vary with dose, how you take it, and your own body’s response, so impairment isn’t limited to obvious intoxication.

That’s why the statement that all drugs have an effect is the best choice: it recognizes the broad range of substances that can influence driving, and the real risk they pose behind the wheel. The other options misrepresent the situation: some drugs do have an effect, and drug effects aren’t limited to when alcohol is involved. If you’re using a medication and aren’t sure how it affects driving, check the label and avoid driving until you know.