Which automation tool would you use to create a list that continuously updates to include non-customers interested in a specific product?

The correct choice to create a list that continuously updates to include non-customers interested in a specific product is a dynamic list.

Dynamic lists are designed to automatically update based on criteria set within the list parameters. This means that as new contacts meet the specified conditions—such as showing interest in a particular product—they will be added to the list in real time. This feature allows marketers to maintain an up-to-date list of potential leads without manual intervention, making it highly efficient for ongoing campaigns or targeted marketing efforts.

In contrast, the other options serve different purposes. Segmentation rules and automation rules are primarily used for organizing and acting upon data based on set criteria, but they do not inherently provide a continuously updating list feature. Completion actions are typically used to trigger specific actions when a contact completes a particular behavior or reaches a certain stage in a process; they do not create an updating list. Therefore, dynamic lists are specifically suited for the task of continuously compiling a list of interested non-customers.