Which Statement Describes What the Impact of Methane Might Be

Multiple Choice

Which statement describes what the impact of methane might be as global warming progresses? 

A)  Methane might be absorbed from natural wetlands with rising carbon dioxide. 
B)  Methane may be reduced by bacteria in tundra soils. 
C)  Methane may be released from oceanic mud as ocean waters warm. 
D)  Methane might be absorbed as permafrost melts in the arctic tundra.