Which statement is used to stop event propagation in JavaScript?

The statement used to stop event propagation in JavaScript is designed to prevent the event from bubbling up to parent elements within the DOM hierarchy. When you use event.stopPropagation(), it ensures that the event does not trigger any handlers on ancestor elements, thereby isolating its effect to the current element only. This is particularly useful in scenarios where you want to manage events more granularly without having them interfere with each other.

For example, if you have a button inside a form and both elements have their own event listeners that could conflict, calling event.stopPropagation() within the button's event handler will prevent the form's event handler from being executed when the button is clicked.

The other options do not serve this purpose. While event.preventDefault() is used to prevent the default action associated with the event (like stopping a link from navigating), event.terminate() and event.preventCapture() are not standard JavaScript event methods. They do not exist in the context of managing event propagation in JavaScript. Thus, the correct choice clearly indicates the appropriate method to achieve the desired effect of stopping the event from bubbling up.