The accompanying figure depicts natural fluctuation of ozone levels in Switzerland between 1925 and 1976. Dobson units are a way to measure the total amount of atmospheric ozone above a point on the Earth's surface. What can you conclude from this figure? 
A) Natural fluctuation of ozone levels varies greatly year to year, so the average for this 50-year span was approximately 330 Dobson units.
B) Switzerland can be used as a model example of how to maintain safe ozone levels.
C) All small European countries will show fluctuations in ozone concentration levels.
D) Ozone levels show a distinct pattern of increasing by 10 Dobson units every 10 years.
Correct Answer:
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