Concept:
When a PowerPoint presentation is running in Slide Show mode, users often need a quick way to terminate the presentation and return to the editing interface.
Step 1: Understand Slide Show Mode.
Slide Show mode displays slides in full-screen format for audiences.
During presentations, navigation keys allow movement between slides and control over the presentation.
Step 2: Function of the Esc key.
The Escape (Esc) key immediately:
• Stops the slide show.
• Exits presentation mode.
• Returns to the normal editing view.
This shortcut is universally recognized in PowerPoint.
Step 3: Evaluate the remaining options.
Backspace usually moves to the previous slide.
Delete removes selected objects.
Ctrl+Enter performs different functions and does not exit the presentation.
Step 4: Conclusion.
Therefore, the shortcut key used to exit a PowerPoint presentation is Esc.
Hence, option (A) is correct.