Your question is Correlation Versus Causation Explanation. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing an analysis where two business metrics move together, and a client asks whether one is causing the other. You need to explain the distinction clearly without relying on technical jargon.
Explain the mathematical difference between correlation and causation to a non-technical client.