pick from the following.
- change its material;
- make it stay the same;
- lowered energy cost;
- duplicate itself;
- Relieve pain;
- change its shape;
- change its color;
- It gets heated up;
Q: You are presented with the quiz "What does sharpening a knife do?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sharpening an object causes that object to change shape" and "very often their only metal object in the house is a cooking pot or a knife". So, what's the best answer to the question?
A:
change its shape