Part A: The correct answer is A. when the audience knows something a character does not.
Part B: To identify the line of dialogue that exemplifies dramatic irony, we need context about what the audience knows that the character does not. Given only the options you provided, it’s difficult to determine the specific example without the accompanying passage. However, often in these types of questions, the line of dialogue that implies misunderstanding or a contrast between what the character believes and what the audience knows is the dramatic irony.
If I were to speculate without context, the line that could most likely fit the concept of dramatic irony would be D. We think the—cat got it. (paragraph 27), as it suggests a misunderstanding about an event or condition that the audience might recognize differently. However, please refer to the passage to confirm if any of the options reflect that dramatic irony based on the context.