According to this graph of changes in Earth's atmosphere, which of the following took place between the years 1800 and 2000? 
A) Nitrous oxide (N₂O) levels increased from 270 ppb to 390 ppb.
B) Carbon dioxide (CO₂) levels increased from 950 ppb to 1,800 ppb.
C) Carbon dioxide (CO₂) levels increased from 290 ppm to 380 ppm.
D) Methane (CH₄₎ levels increased from 270 ppm to almost 2,000 ppm.
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