The correct option is B Sedative
LSD or lysergic acid diethylamide is mood-changing chemical.
A sedative or tranquillizer is a substance, that induces sedation by reducing irritability or excitement of nervous activity.
Narcotics are any of a class of substances that blunt senses.
Stimulant is psychoactive drugs, that induce temporary improvements.
So, the correct answer is option D.