Which of the Following Characterizes CFCs

Multiple Choice

Which of the following characterizes CFCs? 

A)  CFCs are stable, odourless, non-flammable, nontoxic, and noncorrosive chemicals. 
B)  CFCs only remain in the atmosphere for two to five years. 
C)  CFCs are important because they help prevent ultraviolet radiation from reaching the Earth's surface by screening it out. 
D)  Over 44 years passed from the first production of CFCs until the first awareness that they could cause environmental damage.