The freezing point of a diluted milk sample is found to be -0.2°C, while it should have been -0.5°C for pure milk. How much water has been added to pure milk to make the diluted sample?

• A. 2 cups of water to 3 cups of pure milk
• B. 1 cup of water to 3 cups of pure milk
• C. 3 cups of water to 2 cups of pure milk
• D. 1 cup of water to 2 cups of pure milk