The "Asian Brown Cloud" Is the Name Given To

The "Asian Brown Cloud" is the name given to:

A) a layer of pollution that hangs over China and India.
B) an endangered species of tree that grows high on the hillsides of the mountains between China and India.
C) the fallout of the Fukushima nuclear disaster.
D) a disastrous weather pattern, like El Niño, that brings floods and storms to Southeast Asia several times each decade.
E) a type of mushroom that is now nearly extinct due to overdevelopment.