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.

Stable

A state of equilibrium or the absence of significant change, often describing systems that return to equilibrium after a disturbance.

Environmental Damage

Harmful effects on the natural environment caused by human activities, including pollution, habitat destruction, and depletion of resources.

Ultraviolet Radiation

A form of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays, harmful to living organisms in high doses.