A. Reuse the event logic in a component bundle, by putting the logic in the helper.

This is a good practice because placing reusable logic in the helper promotes modularity and reusability. It helps keep the code organized and maintainable, allowing different parts of the component to call the same helper methods.

C. Handle low-level events in the event handler and re-fire them as higher-level events.

This practice is beneficial as it promotes the separation of concerns. Handling low-level details in specific handlers and then re-firing them as higher-level events allows for a clear and manageable flow of events. This makes the application easier to understand and maintain, especially as it scales.