Which of the Following Is an Example of Adverse Impact,a

Which of the following is an example of adverse impact,a criterion used in determining whether companies have engaged in discriminatory hiring and promotion practices? 

A)  ​A company's hiring policies dictated that only 10% of the employees in the company can be women. 
B)  ​The women in a company were given responsibilities equal to that of men but were paid lesser salaries than men. 
C)  ​Sixty percent of the questions on a competitive exam taken by blacks, Hispanics, and Chinese were on African American history, and most of the candidates who passed the test were blacks. 
D)  ​The chief executive officer of an American company blatantly refused to employ an African American although he had an excellent academic record and was also the best performer in the interview.