Which of These Statements Accurately Reflects the Results of Research

Which of these statements accurately reflects the results of research on diversity in the workplace?

A) Over time at a company, disparity "mountains" become "molehills" as a more diverse group of individuals win promotions to managerial roles.
B) Managers have an ethical and financial duty to maintain disparities in treatment due to irrelevant distinctions such as race and diversity.
C) As most people would expect, minor disparities related to race and gender make little difference in the long run as to the number of female and male managers at a company.
D) Over time, a small but favorable bias to one gender, race, or ethnicity can have significant impacts on who gets promoted to management.