According to realistic conflict theory, what might be the major reason for the changing levels of prejudice and discrimination by White Americans toward the Chinese, Japanese, Irish, and Mexicans in...

According to realistic conflict theory, what might be the major reason for the changing levels of prejudice and discrimination by White Americans toward the Chinese, Japanese, Irish, and Mexicans in American history?

a. Competition for work and political status

b. Degree of White familiarity with the minorities

c. Percentage of minorities enrolled in colleges

d. Differences in job training and skills