Morton Argued That Skull Volume Was Related to Intelligence,and That

Multiple Choice

Morton argued that skull volume was related to intelligence,and that skull volume was correlated with race.This conclusion reflected a bias by Morton to design research to confirm his expectations.Which of the following approaches was responsible for helping to overcome this biased conclusion?

A) Morton became aware of his own preconceptions.
B) A strict protocol was used (all test procedures were identical) .
C) Many scientists researched the problem in different ways.
D) Double-blind studies were used.