Which of the following diagnoses had been considered a disorder in earlier editions of the DSM but was omitted as a diagnosis in 1974?

The phenomenon in which entire groups of people simultaneously begin to behave abnormally is known as

a. mass hysteria. b. exorcism. c. lunacy. d. melancholy.

What type of aggression involves damaging another person's reputation among peers through exclusion and malicious gossip?

a. instrumental aggression b. hostile aggression c. relational aggression d. verbal aggression