Discussion
Which natural source contributes significantly to the release of sulfur dioxide (SO2) into atmosphere ?
Answer: B
The natural source is volcanic eruptions.
Volcanoes release large amounts of sulfur dioxide from magma, both in eruptions and by continuous degassing. A large eruption can inject SO2 into the stratosphere, where it forms sulfate aerosols that cool the climate for a year or more, as after Mount Pinatubo in 1991.
The other three options are man-made sources. Coal-fired power plants and industrial combustion are the largest human sources of SO2, because coal and heavy oil contain sulfur. Automobiles also emit some, from sulfur in fuel. The question asks for a natural source, so only volcanic eruptions fit.
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