Which statement is true about HFCs?

The statement about HFCs being non-flammable is accurate. Hydrofluorocarbons (HFCs) are generally considered to have low flammability under normal conditions. This characteristic makes them advantageous for use as refrigerants in various applications, as they do not ignite easily, reducing the risk of fire in environments where they are utilized.

In contrast, HFCs do not deplete the ozone layer, which is a significant aspect of their design and use; they were developed as a replacement for chlorofluorocarbons (CFCs), which are known to harm the ozone layer. While HFCs are regulated due to their global warming potential, they are not universally banned, as many countries allow their use under specific regulations. Additionally, their cost and market availability can vary and are not universally cheaper than CFCs, especially since HFCs can be more expensive due to regulatory considerations and production practices.