Welcome to your interview.
The question is on your right: Product Sense and RCA. 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.
Tell me about your favorite product and why you like it, and then explain the root cause analysis you would perform for a key issue in that product.