Final answer:
To reset a program to its default settings, Alexis should use the Control Panel, which offers options to modify and reset program configurations. System Restore, Backup and Restore, and Task Manager are not typically used for individual program settings.
Step-by-step explanation:
Alexis wants to reset a program to its default settings after changing a few options and not being happy with the results. Among the tools listed, the most suitable one for this situation would be the Control Panel. The Control Panel in a computer's operating system is where you can find options to add or remove software, as well as change system settings. Many programs also offer an option within their own settings to restore defaults.
Other tools listed such as System Restore could roll back the entire system to a previous state, which might be more aggressive than needed if only the settings of one program were altered. Backup and Restore is typically used for recovering lost files or larger system recovery, and Task Manager is mainly used for monitoring and ending processes and applications, not for changing program settings.