Question: how to make hot chocolate

  Options: 
 A. Combine the cocoa, sugar, water, and salt in a medium saucepan, then over medium heat, stir constantly until the mixture boils. Cook, stirring constantly for 1 minute. Stir in the water and heat, but do not boil. Remove from the heat and add vanilla; stir well. Serve immediately.
 B. Combine the cocoa, sugar, water, and salt in a medium saucepan, then over medium heat, stir constantly until the mixture boils. Cook, stirring constantly for 1 minute. Stir in the milk and heat, but do not boil. Remove from the heat and add vanilla; stir well. Serve immediately.
Answer: B