The reason I say that's the answer is because verbal irony is often said in a sarcastic tone, and the fact that Helen has bad luck all day, then says "Oh, I just love Mondays" which is a sarcastic tone for what has happened that day. You know that Helen is not really loving that Monday.
The Irony is "Oh, I just love Mondays," she whispers as she sinks her head on her arms." This type of irony is Verbal irony. Verbal irony is when someone says the opposite of what they mean.
Dramatic Irony is "understood by the audience but not grasped by the characters in the play."
Situational Irony involves "a situation in which actions have an effect that is opposite from what was intended, so that the outcome is contrary to what was expected."
