I believe the answer to this riddle is either "Easter Egg," or "Easter Egg Hunting."
Douglass is implying that witnessing the celebration has shown him that the nation is even crueler than he thought.
Explanation: Fredrick Douglass explained that the hipocrisy of the country to celebrate freedom and rights while still owning slaves (and having him give a speech) makes the country much worse than he imagined.
C) When Charlotte was in Paris, she bought jewelry for her sister.
None of the other answers are true to the question.
A) her sister didn’t buy jewelry but that’s what the sentence says
B) The sentence says her sister was with her but the text doesn’t say that
D) there’s a new character introduced, referred to as “she”
So the answer is C
Hope this helped!