The verified answer is A. The correct ACL option is the one that permits traffic arriving from G0/0 while denying traffic from G0/1 according to the exhibit direction. ACL placement and direction decide whether packets match at ingress or egress, so the selected list must be applied where the source interface condition is true. Cisco CCNA 200-301 v1.1 places this skill in Security Fundamentals, where the exam expects a working understanding of how the feature behaves on real Cisco networks, not just a memorized command. A list with reversed source logic or the wrong interface direction would either block valid hosts or fail to block the unwanted traffic. In production, this distinction matters because a misapplied command or design choice usually creates an outage, a security gap, or unnecessary troubleshooting noise. The correct choice matches the control-plane, data-plane, wireless, security, or services behaviour described in the scenario and should be preferred over options that merely sound related.