Answer:
c. Eraser
Explanation:
If you want to remove pixels altogether—instead of replacing them with similar pixels—the Eraser tool might be your friend. I say it might be your friend because, in general, the Eraser tool is not the most graceful way to achieve most goals. But it's a good tool to have on backup in your toolbox.
The Eraser tool eraser.jpg appears to erase content, but it's not actually erasing anything. If you're working on a background layer or a layer with transparency locked, it replaces the pixels with the current background color. Otherwise, it replaces the pixels with transparency.
Probably the neatest way to use this tool is to use it when you want to restore the image to its previous state. Select Erase to History in the options bar—and the Eraser tool will do just that. It's handy if you aren't so keen on a change you made, or if you want to keep the change but have it affect a smaller area of the image.
