Answer:
The correct answer is the second option: The audience knows that Nora has lied and that therefore Helmer's complaint about liars is contradictory to his actual situation.
Step-by-step explanation:
Dramatic irony happens -as in the options provided- when the audience knows something that the characters of the: movie, play, etc.… don’t. The other options provided may be examples of drama, however, not irony; as irony itself means: incongruity. In the light of Nora lying and knowing Helmer’s complains about liars, we have an irony and a perfect example of dramatic irony here, as we know what will happen next, but Helmer and Nora don’t.