Final answer:
To reset an image in PowerPoint, Samantha can either press 'Ctrl' + 'Z' to undo the last action or go to the 'Format' tab and click on 'Reset Picture' to revert the image to its original state.
Step-by-step explanation:
If Samantha wants to reset an image to undo the changes she made in her PowerPoint presentation, the most direct ways are options 2 and 3 from the list. She can either press the 'Ctrl' and 'Z' keys simultaneously which is a universal shortcut for undoing the last action across most software, including Microsoft PowerPoint. This will revert the most recent change made to the image. If she has made several changes and wants to revert the image back to its original state since inserting it, she will need to go to the 'Format' tab and select 'Reset Picture'.
Option 1, which is right-clicking on the image and selecting 'Reset', does not exist in PowerPoint's context menu, so it would not work here. Option 4 would also work but is the least efficient, as it involves deleting and re-inserting the image, which can be time-consuming and might not always result in the same placement or formatting as the original.