Which event occurs when a select object loses focus after the user makes a selection other than the default?

The correct choice is "onchange." This event specifically triggers when a user makes a selection from a select element and then the element loses focus, meaning that the user has clicked away or tabbed out of the select box. It indicates that the value of the select element has changed from its original state, which is especially important for scenarios where user input is required for further actions, such as form submission or dynamic content loading.

In contrast, the "onblur" event occurs when an element loses focus but does not necessarily indicate that a change in the selection has occurred—it's merely about the focus state. The "oninput" event is associated with elements that provide input, such as text fields. It fires whenever the value of an element changes, but its context is different from that of a select element. Lastly, "onfocus" pertains to when an element gains focus, not when it loses focus, which is contrary to what the question is asking for. Understanding these differences is key in effectively managing user input in JavaScript.