Franz Samelson Argues That American Psychology's Transition from Racism in the 1920s

Franz Samelson argues that American psychology's transition from racism in the 1920s to arguments of cultural bias in the 1940s was due to

A) an influx of more diverse psychologists, especially Jewish psychologists, whose interpretations of the data were different
B) new data in the 1950s that were incontrovertible in demonstrating no differences in intelligence across the races when environmental
circumstances were considered
C) a vast change in American society in the 1940s that reduced racial prejudice
D) a backlash in psychology against the prevalence of hate groups in America