Twenge Concluded from Her Studies of Cohort Effects from 1968

Twenge concluded from her studies of cohort effects from 1968 to 1993 that

A) females internalized the social change and cultural messages of the era, and their personalities were molded by these messages.
B) cohort effects are interesting to study historically, but of little relevance to personality psychology.
C) social and cultural changes had only marginal effects on personality.
D) the culture in which an individual is immersed is the major determinant of personality.