Answer: B) "To think of your having such a tragedy in your life!"
Step-by-step explanation: an irony is a statement or a situation that seems contradictory or different of what the reader or the characters expect. It is often used to criticize something or to introduce a humorous element in the text. In the given excerpt from "Editha" by William Dean Howell, the expression "to think of your having such a tragedy in your life" is an example of the use of an ironic tone, because the woman doesn't really think that war is a tragedy.