Cushioning foams can adversely affect the IAQ. To construct polyurethane foam, some products have a substance that is being phased out in developed countries. What is this substance?

A. CFCs (Chlorofluorocarbons)
B. VOCs (Volatile Organic Compounds)
C. PBDEs (Polybrominated Diphenyl Ethers)
D. PCBs (Polychlorinated Biphenyls)