A discourse community can be described as a group of people that share common goals, sources of information, terminology, and methods of communication along with a certain level of expertise and knowledge on a subject. However, it is often distinguished from 'speech community' on the grounds that speech communities are sociolinguistic groupings with communicative needs such as socialisation and group solidarity, whereas discourse communities are groupings based on common interests.
Paragraph four of Anna Quindlen "Quilt of a country" is mainly constructed with questions, and repeats the words "What is the point" at the beginning of each question.
She is trying to prove her point, that despite all of the cultures and ethnicities and different backgrounds that constitute the American people, it is not enough to disintegrate the nation, while other countries were torn apart by these differences.
1). For this one the quote is "Being Southerners, it was a source of shame to some members of the family that we had no recorder ancestors on either side of the Battle of Hastings"(3-4).
2). The quotation for this one is "...people still looked at the Radley Place, unwilling to discard their initial suspicions"(10-11).
3). Quotation "The sheriff hadn't the heart to put him in jail alongside Negroes, so Boo was locked in the courthouse basement" (14).
4). "...nowhere to go, nothing to buy, and no money to buy it with, nothing to see outside the boundaries of Maycomb County" at this part of the text: (6).
Hope this helps.
I would go with choice D) or the fourth option because that shows that the job is so dangerous they have to look at each other to make sure neither one of them has anything dangerous in their hands.