Which devotee of late modern abstraction is considered to be one of the leading post-WWII African American painters?

Question

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Samuel Gilliam is considered one of the leading post-WWII African American painters and a key figure in the Washington Color School, a group of artists interested in exploring color and abstraction. While the other options listed are significant artists in their own right, they are not African American painters known for their devotion to late modern abstraction.

Which Devotee of Late Modern Abstraction Is Considered to Be