Which of the Following Is True of the Classic Robbers

Which of the following is true of the classic Robbers Cave study by Sherif and Sherif (1967) ?

A) It demonstrated that when the in-group and out-group mentality develops, prejudice and hostility are likely to follow.
B) It showed just how obedient males and females can be when faced with an authority figure.
C) By providing unlimited resources, groups did not need to work together; the hostility ended and friendships eventually formed.
D) It demonstrated that when the in-group and out-group mentality develops, prejudice and hostility are likely to follow, and by limiting resources, thereby forcing the groups to work together, the hostility ended and friendships eventually formed.