Finish the following sentence with the best choice: To soften butter quickly.

Choices:
- Pour frozen water into a glass to heat it up. Then, dump out the water and place it over the stick of butter. The butter will be softened within minutes without it completely melting.
- Pour boiling water into a glass to heat it up. Then, dump out the water and place it over the stick of butter. The butter will be softened within minutes without it completely melting.

Answer:
Pour boiling water into a glass to heat it up. Then, dump out the water and place it over the stick of butter. The butter will be softened within minutes without it completely melting.