Question: To test baking soda to make sure it's still good.

  Options: 
 A. Add a teaspoon of baking soda to a 1/2 cup of hot water. If it doesn’t bubble, it’s time to throw it away.
 B. Add a teaspoon of baking soda to a 1/2 cup of cold water. If it doesn’t bubble, it’s time to throw it away.
Answer: A