According to the resource-theory of the firm discussed in McNett's article The Ethics of Workplace Diversity, the main reason for an organization to have a more diverse workforce would be

a. to avoid lawsuits
b. to attract the best and most diverse talent that can become a competitive advantage in diverse markets.
c. to satisfy the requirements of the Human Resources Department.
d. to manage in an ethical socially responsible manner.

b. to attract the best and most diverse talent that can become a competitive advantage in diverse markets.