Writing in the 1930s, Social Psychologist Otto Klineberg, Was One

Writing in the 1930s, social psychologist Otto Klineberg, was one of the earliest psychologists to suggest that

A) there were no differences in reaction time across races
B) cultural bias was not sufficient to account for the obtained differences in intelligence across the races
C) there was no scientific evidence of racial differences in intelligence
D) racial differences on psychological tests were likely due to genetic differences