Choose the correct option to replace the underlined part: Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.

A    ozone is formed in the atmosphere from

B    ozone is formed in the atmosphere when

C    ozone is formed in the atmosphere, and when

D    ozone, formed in the atmosphere when

Solution

Correct Answer: Option B

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