Finish the following sentence with the best choice: How do you make fabric softener crystals?

Choices:
- Just mix one cup of Epsom salt with 10 drops of your favorite scent of essential oil.
- Just mix one cup of Epsom salt with 10 drops of your favorite scent of essential soil.

Answer:
Just mix one cup of Epsom salt with 10 drops of your favorite scent of essential oil.