The excerpt in this question comes from the story of "The Life You Save May Be Your Own” by Mary Flannery O'Connor.
Mary Flannery O’Connor was an American writer, she wrote two important novels, “Wise Blood” and “The Violent Bear it Away”, and many short stories.
The “The Life You Save May Be Your Own” tells the story of an old woman and her daughter who is deaf and mute and live by themselves in a farm. The old lady wants to marry her daughter and a man who arrived at the farm to help fix problems at the farm seems like the perfect candidate for the daughter. After some time the man, Mr. Shiftlet, accepts to marry Lucynell, but on one occasion he left her sleeping in a road restaurant and leaves forever.
The general idea of the novel is that of a stranger who arrives to the lives of two women and provokes a change in their lives, just as in “Good Country People”.
The sentence that best describes de concept of the irony in the excerpt is:
C. Instead of experiencing the joy of gaining a son-in-law, Mrs. Crater feels the sorrow of losing her daughter.