The words below match items on the diagram

The Calvin Cycle	RuBP Regeneration Reaction
Ribulose-1, 5-Biphosphate (RuBP)	Phosphohexose (B)
CO	Phosphopentose (A)
3-Phosphoglycerate	Phosphotetrose (C)
ATP/ADP	Phosphoheptose
3-Diphosphoglycerate
NADPH/NADP
Glyceraldehyde-3-Phosphate (D)