Tramly 是一家致力于改善转化率优化效果的企业。小玛负责确定 Tramly 中有哪些项目值得测试，她打算借助 PIE 框架来完成这项工作。 下列哪个问题符合 PIE 框架标准？

The PIE framework (Potential, Importance, Ease) helps prioritize optimization efforts. "How valuable is the traffic on this page?" directly addresses the 'Importance' component of PIE, as it quantifies the potential impact of improving the page's conversion rate. Understanding traffic value helps determine if optimizing the page will yield significant returns. "Can the click-through rate of this ad be further improved?" focuses on a metric but doesn't directly assess the overall importance or potential impact on conversions. "Why does most of the website's traffic come from mobile devices?" and "Why does one Google Ads campaign perform better than others?" are diagnostic questions about existing performance, not prioritization questions within the PIE framework.