Final answer:
Methamphetamine is a stimulant drug that increases activity and alertness in the central nervous system.
Step-by-step explanation:
A stimulant is a type of drug that increases activity and alertness in the central nervous system. Out of the given options, the drug that would be considered a stimulant is methamphetamine. Methamphetamine stimulates certain chemicals in the brain, leading to increased energy, focus, and euphoria.
Learn more about stimulant drugs