Which statement explains how smog forms?

volcanoes erupt and release ash into the sky.
strong storms pick up soil and mix it with fog.
sunlight and heat react with gases in the atmosphere.
gases move high into the atmosphere and then fall to earth in rain.

Sunlight and heat react with gases in the atmosphere.

Explanation:

Smog forms purely as a result of air pollution.

Gases released from machines on earth rise up the sky.

The risen gases then meet and react with the sun plus fine particles in the atmosphere, smog forms.

Smog causes a lot of problems on earth among them being:

the answer is c. it will give up it's valence electron to the other atom.

its probably to later but whats the question