In the remote ice fields of Greenland, glaciologists have uncovered evidence of microorganisms living within the ice, which possess unique biochemical mechanisms allowing them to metabolize sulfur compounds in extremely low temperatures. This discovery, led by Fiona Zheng, contradicts the long-held assumption that microbial life could not sustain metabolic activities in such harsh, cold environments. Utilizing advanced cryo-electron microscopy and isotopic analysis, Zheng's team demonstrated that these microorganisms play a crucial role in the ice's sulfur cycle, a finding that significantly alters our understanding of biogeochemical cycles in polar regions. Considering the unique adaptations of these microorganisms, Zheng proposed that ______15Mark for ReviewABCWhich choice most logically completes the text?Athe metabolic processes of these microorganisms are less efficient in cold environments compared to those in temperate regions, indicating a limitation in the diversity of life forms that can exist in polar ice fields.Bthe reliance on sulfur compounds for metabolism by these microorganisms suggests that sulfur may be more abundant in Greenland's ice fields than previously thought, requiring a reevaluation of the chemical composition of polar ice.Cthe discovery of these microorganisms indicates a need to reassess the impact of global warming on polar ecosystems, as the melting ice could release trapped microorganisms and alter global sulfur cycles.Dthe existence of sulfur-metabolizing microorganisms in Greenland's ice fields suggests that life can adapt to and thrive in more extreme conditions than previously believed, expanding the potential habitats for microbial life on Earth.