How can nitrogen return to the atmosphere?

Nitrogen is returned to the atmosphere by the activity of organisms known as decomposers. Some bacteria are decomposers and break down the complex nitrogen compounds in dead organisms and animal wastes. This returns simple nitrogen compounds to the soil where they can be used by plants to produce more nitrates.

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 Denitrification completes the nitrogen cycle by converting nitrogen back to gaseous nitrogen . Denitrifying bacteria are the main thing of this process. These bacteria use nitrate instead of oxygen when obtaining energy, releasing nitrogen gas to the atmosphere.

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what are the events?

the 2nd option is the answer