A is the correct answer i really hope this helps!
Answer:
I think it might be a closed system
2.13 miles
You can also check it on google
Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants. ... Individual CFC molecules are labeled with a unique numbering system
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im pretty sure it is Mn02