The most accurate response that captures the effect of the dramatic irony in the passage is:
The reader knows that the box contains the purse Nikka wanted, so the effect is to experience the humor and anticipation of the scene.
This response highlights how the reader is aware of the truth about the gift while Nikka mistakenly believes it is a canteen. This misunderstanding creates a humorous and tense moment, leading to an anticipatory payoff when Nikka discovers the actual gift.