I believe the answer is D, they were very prejudice. I hope this helps!
Answer:
c. the effect of being studied
Explanation
George Elton Mayo was a famous Australian industrial researcher and a psychologist. Elton Mayo's theory states that the employees are more motivated by relational factors than by monetary factors or rewards. These relational factors includes camaraderie and attentions. This factors motivates the employees and the productivity of the employees are increased.
In order to prove his theory, he did change few variables in order to increase the productivity and thus he concluded that the effect of being studied is the true reason for the increase in productivity.
Barack Obama's wife name is Michelle Obama.
Mariana islands and Germany and the us won
