Recall that sherif and his colleagues (1961) created conflict between two groups of boys in a summer camp. intergroup hostility was relatively easy to generate. to do this, the researchers first and then

COMPETITION STAGE AND FRUSTRATION

Explanation:

Muzaffar sheriff was a famous social psychologist who has given the psychological understanding of groups and their members. He has given a realistic conflict theory and accounts for group negative perception for another group, prejudice, hatred, stereotypes being the result of competition and aggression among the group. The sheriff stated his theory in one of the famous experiment called the robber's cave. however, this study has been criticized at many points in the experiments, for example as the two groups were on artificial competition which was not in real life. The competition spreads a plaque among the group which was not appreciated.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."