Following are descriptions of behavior that are characteristic among users of certain classes of drugs. For each description, indicate the class of drug (narcotics, stimulants, and so on) for which the behavior is most characteristic. For each description, also name at least one drug that produces the described effects. a. Slurred speech, slow reaction time, impaired judgment, reduced coordination b. Intense emotional responses, anxiety, altered sensory perceptions c. Alertness, feelings of strength and confidence, rapid speech and movement, decreased appetite d. Drowsiness, intense feeling of well-being, relief from pain