How Do Opiates Compare with CNS-Stimulating and CNS-Depressant Drugs

How do opiates compare with CNS-stimulating and CNS-depressant drugs?

A) Opiates depress activity in parts of the cerebral cortex and create excitation in other parts.
B) Opiates all show very little physical dependence.
C) Opiates are more likely to be legal.
D) All three varieties of drugs cause dreamlike fantasies and hallucinations.