One Key Contributing Factor to the Los Angeles Smog Problem

One key contributing factor to the Los Angeles smog problem is the fact that .

A) the Hadley cell for that area drops cool air, and pollution, right over Los Angeles
B) the offshore breezes carry inland pollution to coastal Los Angeles
C) incoming tides in the harbor push air pollution ahead of them
D) there are so many rainy days, increasing the acidic deposition
E) Los Angeles and its suburbs are all ringed by mountains