Final answer:
The command to fix common image problems with one click in iPhoto and Keynote is "Enhance". It auto-adjusts various image attributes to improve its quality.
Step-by-step explanation:
In iPhoto and Keynote, the command that allows you to fix common image problems with one click is: a)"Enhance." The "Enhance" feature is designed to automatically adjust and improve the visual quality of an image by applying various corrections, such as adjusting brightness, contrast, and color balance. This one-click enhancement is convenient for users who want to quickly improve the appearance of their photos or images without manually adjusting individual settings. In iPhoto, the "Enhance" button is typically represented by a magic wand icon, while in Keynote, it can be found in the image editing tools. The option may vary slightly between versions, but the functionality remains consistent.