The correct answer is D. Because an appositive phrase is usually separated from the rest of the sentence with the use of commas, just like in this case. And it refers to the noun, the subject. In this case, the appositive phrase is 'the youth council president', and it refers to, or renames 'Stephanie'.
Free (someone or something) from a constraint or difficulty
Well "universe of obligation" is when you are neighborly and help each other out. But in the South the "universe if obligation" is simply being Christian. So basically they treat people the way they would want to be treated. Since Miss. Maudie is a lonely woman and is basically helpless, people feel as if they should help someone like her.
