Option C, 'continued to face unfair employment practices and barriers to where they could live' best supports the answer to Part A.
Step-by-step explanation:
The detail that best supports the answer to Part A is option C, which states that African Americans 'continued to face unfair employment practices and barriers to where they could live.' This detail aligns with the idea that despite the African-American population growth in Pittsburgh, they still faced discrimination and limited opportunities for employment and housing.