Which of these platforms can be connected to Analytics so that you can test variants of your web pages with specifically tailored audiences?

Google Optimize is the correct answer because it is Google's A/B testing and personalization tool designed to integrate directly with Google Analytics. This integration allows users to create experiments (like A/B tests, multivariate tests, and redirect tests) on their web pages and target specific audience segments defined in Analytics. The results of these experiments are then reported back in Analytics, providing insights into how different page variants perform with different user groups. Search Console is for monitoring website performance in Google Search. Modify event is a feature within Google Analytics 4 for altering event data, not for A/B testing web pages. Firebase is a platform for developing mobile and web applications, offering analytics for app usage but not for A/B testing website content in the same way Google Optimize does.