A class of substances producing feelings of well being, wakefulness and increased energy is:

A. Inhalants: These may produce a brief euphoric effect, but they primarily depress the CNS and can cause confusion, dizziness, or death. B. PCP's: PCP is a dissociative hallucinogen and does not produce stimulation or energy-it can cause detachment and aggressive behavior. C. stimulants: Stimulants (e.g., amphetamines, cocaine) increase CNS activity, producing energy, euphoria, and alertness. D. hypnotics: These are CNS depressants used to induce sleep and relaxation—not wakefulness or energy.