If the Earth Were in a Cooling Trend,which Process Below

Multiple Choice

If the Earth were in a cooling trend,which process below would most likely act as a positive feedback mechanism?

A) increasing the snow cover around the Earth
B) increasing the water vapor content of the air
C) ​decreasing the amount of low stratified cloud cover around the globe
D) increasing the carbon dioxide content of the air
E) ​decreasing snow cover in middle and high latitudes