(C) The most abundant enzyme in the biosphere is $RuBisCO$ (Ribulose$-1,5-$bisphosphate carboxylase-oxygenase).$RuBisCO$ is a key enzyme in the Calvin

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(C) The most abundant enzyme in the biosphere is $RuBisCO$ (Ribulose$-1,5-$bisphosphate carboxylase-oxygenase).$RuBisCO$ is a key enzyme in the Calvin cycle of photosynthesis.This enzyme requires $Mg^{+2}$ ions as a cofactor for its catalytic activity.Therefore,the correct option is $C$.