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

This practice allows for better abstraction and modularization of code. By handling low-level events first and then firing higher-level events, you can create a more organized and manageable event architecture.

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

This promotes the reuse of code and ensures that event handling logic is consistent and maintainable. By placing reusable logic in the helper, you can keep your components clean and focused on their primary responsibilities while sharing common functionality across different parts of your application.