What action should you take if you realize you selected the wrong rental car provider on the Trip Summary screen?

If you realize that you have selected the wrong rental car provider on the Trip Summary screen, the appropriate action is to cancel under the Rental Car Payment Summary. This approach effectively allows you to nullify the incorrect selection before making a new choice. Cancelling the incorrect rental car provider ensures that you do not proceed with an erroneous reservation, which could lead to complications later, such as charges or unavailability issues.

The other options either suggest making changes to an existing reservation or saving selections that would not rectify the issue of having chosen the wrong provider. For instance, editing the reservation may not necessarily allow you to change the provider easily, and saving changes could confirm the incorrect selection, which is not desirable. Selecting a new provider without cancelling the incorrect choice could lead to overlapping reservations or confusion about which provider to utilize. Thus, cancelling the wrong choice is the most straightforward and effective way to resolve the situation.