小蘿已經為「安心購」企業列出優先測試的項目清單，目的是要改善使用者體驗，同時讓使用者在這家企業的應用程式中完成所需操作。 下列何者是小蘿可用於該應用程式的測試工具？

Firebase A/B Testing is the correct choice because it is specifically designed for testing changes within mobile applications to optimize user experience and conversion goals. It allows developers to run experiments on different versions of app features, UI, or messaging, and analyze their impact on user behavior. Google Optimize is primarily for website testing. Dart is a programming language, not a testing tool. Gerrit is a code review tool, not an A/B testing platform.