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Calvin cycle is a cycle of light-independent reactions that involves the formation of glucose from carbon dioxide.

$C{o}_2$(carbon dioxide) is needed along with $RuBP$(ribulose, bisphosphate) to produce $G3P$(glyceraldehyde, phosphate).

Ribulose, bisphosphate carboxylase /oxygenase$RuBP$ is an enzyme that is used to initiate the reaction between and in the cycle.

$RuBP$and$G3P$ are involved in initiation of the Calvin cycle.

Hence, the options a, b, and d. are incorrect.

Rubisco catalyzes the reaction of carbon dioxide and RuBP to form $3-$PGA ($3-$Phosphoglycerate ). NADPH ( reduced nicotinamide adenine dinucleotide phosphate) and ATP (adenosine triphosphate) produced during the light-dependent reactions are also used to convert $3-$PGA molecules into G$3$P