Answer: C) Instead of experiencing the joy of gaining a son-in-law, Mrs. Crater feels the sorrow of losing her daughter.
Explanation: an irony is a state of affairs or an event that seems contrary to what one expects and it often has an amusing result. In the given excerpt we can see the description of a situation in which a mother is really sad because she is going to be separated from her daughter for two days. This situation is an example of an irony because Mrs. Crater feels the sorrow of losing her daughter instead of experiencing the joy of gaining a son-in-law.