Consider the relevance of the following features for causing photochemical smog:1. Air stagnation.2. Abundant sunlight3. High concentration of NOx in atmosphere.4. High concentration of SO2 in atmosphere.Which of the above features are correct?

Consider the relevance of the following features for causing photochem

1.	Consider the relevance of the following features for causing photochemical smog:1. Air stagnation.2. Abundant sunlight3. High concentration of NOx in atmosphere.4. High concentration of SO2 in atmosphere.Which of the above features are correct?
A.	1, 2 and 4 only
B.	3 and 4 only
C.	1, 2 and 3 only
D.	1, 2, 3 and 4
Answer» E.