A because it all renames the subject.
B To show someone's distinct voice.
The answers is problem and solution
In mark twains piece of literature, the invalids story, irony is repeatedly used
- they don't want to get sick from the smell, but they eventually get sick from the coldness
- dramatic irony; the responder knows that a bag of cheese was left on the box, but the two men in the train don't know this
