Your question is Choose Fraud Rule Tradeoff. 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).
If you have to choose between a rule that catches 95% of fraud but blocks 5% of good users, versus a rule that catches 80% of fraud but blocks 0.5% of good users, how would you make that decision?