Concerns about Constitution
In Observations on the New Constitution, Warren expressed the concern that the Constitution set no limits on the power of the judiciary and contained no rotations of offices or term limits for federal officials.
By ending secret balloting
These all have to do with the Legislative Branch, which is covered in Article 1 of the Constitution.
So the answer is A) Article I.
Pretty sure your answer is B. They didn't get equal rights until the 60's, I don't believe they were removed from jobs, and I'm fairly certain they wouldn't have done work without pay (The Great Migration is a good example of that).