Answer:
The answer is D. Passive aggression.
Passive-aggressive behavior, as its name might suggest, is people's tendency to indirectly express discontent about a particular situation. Passive-aggression often includes hostility, frequent complaints or intentional procrastination. In this case, Chad first resisted going to the opera, and although he eventually agrees to go, he is still dissatisfied and would rather not go. As a result, he made a sarcastic remark.