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Hydrofluorocarbons (HFCs) are a class of compounds composed primarily of hydrogen, fluorine, and carbon. The defining characteristic of HFCs is that they contain hydrogen atoms in addition to fluorine and carbon, which contributes to their chemical properties and behavior. The presence of hydrogen allows HFCs to be less damaging to the ozone layer compared to their predecessors, such as chlorofluorocarbons (CFCs), which contain chlorine.

The inclusion of fluorine in HFCs gives these compounds their refrigerant qualities, making them effective in cooling and air conditioning applications. While the other options mention atoms such as sulfur, nitrogen, and chlorine, these elements do not constitute HFCs, making the choice that incorporates only hydrogen and fluorine the most accurate representation of HFCs' composition. This understanding is essential, particularly in the context of environmental regulations and alternatives being sought for substances with high global warming potential.