Which of the following best describes Leon Sullivan's contribution?

Leon Sullivan's most notable contribution was as the first African American appointed to the General Motors Board of Directors. His role in this position was significant not only for his personal accomplishments but also for the representation of African Americans in corporate leadership during a time when such opportunities were rare. This milestone allowed Sullivan to influence corporate policy and advocate for minority representation and opportunities within the business sector.

While Sullivan was indeed involved in various social justice movements and contributed to education, particularly through his work in promoting programs that improved the conditions for African Americans and underprivileged communities, his position on the GM Board is widely recognized as a groundbreaking achievement that exemplified his impact in the corporate world.