(C) The dark reaction (Calvin cycle) begins with the carboxylation phase.In this step,$CO_2$ is fixed by attaching it to a $5$-carbon sugar called Rib

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Attachment of $CO_2$ to a pentose sugar

(C) The dark reaction (Calvin cycle) begins with the carboxylation phase.In this step,$CO_2$ is fixed by attaching it to a $5$-carbon sugar called Ribulose $1,5$-bisphosphate $(RuBP)$.This reaction is catalyzed by the enzyme $RuBisCO$,resulting in the formation of $3$-phosphoglycerate $(3-PGA)$.