A substance that can be ingested and may affect physical or psychological functioning is a ...

• A. Dietary supplement
• B. Drug
• C. Discrimination
• D. Displacement

Answer: (B)

A drug is any chemical that, when taken into the body, can alter how the body works or how the mind behaves. This includes medicines, caffeine, alcohol, illegal substances, and other substances that can change mood, perception, or physical performance. They act on the brain and body to produce those changes, which is why they’re described as affecting physical or psychological functioning.

Dietary supplements are meant to support nutrition or health, and while some may have effects, they’re not defined by purposefully altering mental or bodily functioning in the same way drugs are. Discrimination and displacement are psychological concepts about coping and defense mechanisms, not substances ingested to change functioning. So the term that fits best for a substance ingested that may affect physical or psychological functioning is a drug.