The answer to this problem is the letter D which is referring to "ending the legal status of slavery". It was Randolph in the year 1963 who never stopped and who is the constant critic of discriminators against black. It was then realized the contributions of black workers in the economy and drew riot by black.
Answer:
astronomy is the correct answer
Langues chose, style of writing, and length of writing would be my answers.
tell me if i'm wrong