Correct Answer - Option 3 : Oxidising smog
Concept:
The smog that occurs in warm (sunlight) and has high concentration of oxidising agent is called photochemical smog/oxidising smog.
Oxidizing smog is formed when the emitted (or primary) pollutants are transformed through photochemical reactions into secondary pollutants.
The most important secondary gases are strong oxidant gases, ozone and peroxyacetyl nitrate. These secondary gases are the major components of oxidizing smog that are harmful to people and vegetation.
Thus, option (c) is the correct answer.
