If Earth Warmed Up,and More Snow Fell Because of More

Multiple Choice

If Earth warmed up,and more snow fell because of more water vapor in the atmosphere,and that snow then reduced Earth's temperature,which increased snow cover,then the initial increase in snow fall would be ______ feedback,while the continued increase in snow fall would be _____ feedback.

A) positive;positive
B) positive;negative
C) negative;positive
D) negative;negative
E) open;closed