In the context of diversity practices in U.S.-based private and public organizations as reported by Ann Morrison, which of the following is one of the most important practices?

A) Excluding diversity in performance evaluations
B) Excluding diversity in management succession
C) Forming internal advocacy groups
D) Emphasizing ethnicity based employment opportunities

According to Ann Morrison's research, forming internal advocacy groups can be one of the most important practices for promoting diversity in organizations. These groups can help raise awareness, provide support, and advocate for diversity and inclusion initiatives within the organization. Excluding diversity in performance evaluations and management succession are counterproductive to diversity and inclusion efforts, while emphasizing ethnicity based employment opportunities can invite accusations of tokenism or reverse discrimination.