Welcome to your interview.
The question is on your right: Best and Failed Campaigns. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
To provide examples of your best and failed campaigns, tell me what you did and what you learned.