82. Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because:

The rise in the amount of chlorine in the stratosphere matches the rise in the amount of fluorine, which has different natural sources than chlorine.
The rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions.
Air samples taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere when compared to CFCs.
All of the above

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