What makes a hydrofluorocarbon different from a chlorofluorocarbon?

• A. The difference is that a hydrofluorocarbon added fluorine for chlorine in a chlorofluorocarbon.
• B. The difference is that a hydrofluorocarbon substitutes fluorine for chlorine in a chlorofluorocarbon.
• C. The difference is that a hydrofluorocarbon removed hydrogen for chlorine in a chlorofluorocarbon.
• D. The difference is that a hydrofluorocarbon substitutes hydrogen for chlorine in a chlorofluorocarbon.

Answer: (D)