What Is the Largest Potential Global Impact Associated with the Melting

What is the largest potential global impact associated with the melting of the frozen peat in northern Canada and Siberia?

A) The melting of the peat will release a large amount of carbon dioxide into the atmosphere.
B) The melting of the peat will cause for a positive feedback loop as the release of methane will cause an increase in temperature and, consequently, more melting.
C) It will cause an increase in fossil fuel use as people would need to move away from the area.
D) The change in temperature will cause for an increase in water content in the subsurface leading to the lubrication of faults and ultimately increased earthquake activity.
E) The melting of the peat will release a large amount of water vapour into the atmosphere.