Final answer:
The Notes group in PowerPoint allows you to add notes to your presentation.
Step-by-step explanation:
The group that allows you to add notes to your presentation is the Notes group.
In PowerPoint, you can add notes to your slides to provide additional information or reminders for yourself or others who may view the presentation.
To access the Notes group, go to the View tab and click on the Notes Page button. This will open a separate page where you can add and edit your notes.