Warming Temperatures Have Accelerated the Thawing of Cryosols (Gelisols)

Warming temperatures have accelerated the thawing of Cryosols (Gelisols) .Why is this of particular concern?

A) Cryosols (Gelisols) contain about half of the pool of global carbon and this release of carbon dioxide and methane into the atmosphere could further affect warming climate.
B) As the permafrost melts,the meltwater will runoff,further contributing to global sea-level rise.
C) Cryosols (Gelisols) are important soils for growing specialty cold weather crops.The thawing of these will adversely impact this lucrative market.
D) Cryosols (Gelisols) are the youngest,least developed soils on the planet.Warming will further stifle the horizontal development of these soils.