What is a key benefit of using event delegation?

The correct answer highlights how event delegation can enhance performance and efficiency in programming, particularly in web development. Event delegation involves attaching a single event listener to a parent element rather than multiple listeners on individual child elements. This approach can significantly reduce memory usage, as fewer listeners mean less overhead for the browser to manage. For instance, if a parent has multiple children that require similar functionality, having a single listener on the parent instead of individual listeners on each child minimizes resource consumption.

Additionally, this technique can enhance the responsiveness of the application, as fewer event listeners can lead to improved processing times, especially in applications dealing with large numbers of elements.

The other options may seem plausible but do not accurately reflect the primary benefit of using event delegation. For example, having separate event handlers for each child element is contrary to the concept of event delegation, which seeks to avoid this redundancy. Simplifying code is a potential side effect, but it does not directly relate to the memory efficiency provided by reducing the number of event listeners. Lastly, while event delegation involves parent-child relationships, it does not eliminate their necessity; rather, it optimizes how events are handled within that hierarchy.