Finish the following sentence with the best choice: How to make blue ice cubes

Choices:
- To make blue ice cubes, mix a hefty amount of blue food coloring to water in an ice cube tray and freeze.
- To make blue ice cubes, mix a hefty amount of blue food coloring to water in an ice cube tray and microwave for 2 minutes.

Answer:
To make blue ice cubes, mix a hefty amount of blue food coloring to water in an ice cube tray and freeze.