Explanation: it’s the only one that makes the most sense in the sentence. If you do, I do not retire agree with you, that don’t make sense. Then the next word, I do not entirely agree with you. That’s makes sense. Then the next. I do not rarely agree with you, that don’t make sense. Entirely is the most logic answer to go with.
Answer: Marian Anderson Sings" uses a cause-and-effect organizational structure; "Marian Anderson: Legendary Singer" does not. Sorry I don’t really have the evidence from the text, but I hope this helps you