Finish the following sentence with the best choice: How do you sharpen a knife?

Choices:
- If you find yourself with a dull knife but without a knife sharpener, you can use the unglazed bottom of a ceramic mug to sharpen small knives. Applying moderate pressure, hold the knife at a 15-degree angle and carefully draw the entire length of the blade across the rough surface.
- If you find yourself with a dull knife but without a knife sharpener, you can use the unglazed bottom of a ceramic mug to sharpen large knives. Applying moderate pressure, hold the knife at a 15-degree angle and carefully draw the entire length of the blade across the rough surface.

Answer:
If you find yourself with a dull knife but without a knife sharpener, you can use the unglazed bottom of a ceramic mug to sharpen small knives. Applying moderate pressure, hold the knife at a 15-degree angle and carefully draw the entire length of the blade across the rough surface.