Which method should you use to implement and test broad match successfully on broad match campaigns to help analyse conversion data?

The correct answer is setting up a One-Click Experiment Apply because this feature is specifically designed to implement and test changes, like adding broad match keywords, in a controlled environment. It automatically creates an experiment, splitting traffic between your original campaign and the experimental version, allowing you to collect statistically significant data on conversion performance before fully applying the changes. This method directly addresses the need to "implement and test successfully" and "analyse conversion data." The other options are incorrect because they don't describe a method for implementing and testing broad match to analyze conversion data. Keyword Planner helps find keywords but doesn't test them. Conversion Tracking tracks conversions but isn't a method for implementing or testing broad match. The keyword match types feature shows how keywords are matched but doesn't facilitate testing new implementations.