The right option is; a. Calvin cycle
Part of the photosynthesis process that puts carbon dioxide into the form of carbohydrates is the Calvin cycle.
Calvin cycle is the set of chemical reactions that occur in the stroma (inner space chloroplasts) during photosynthesis. Calvin cycle occurs after energy has been captured from sunlight. Three-carbon sugar phosphate molecules are the carbohydrate products of the Calvin cycle. In the Calvin cycle, Ribulose bisphosphate, which is a five carbon catcher grabs a molecule of carbon dioxide, and produces a six-carbon molecule. The six-carbon molecule is separated into two equal parts by an enzyme (RuBisCO), using the energy of ATP, and NADPH molecules. Three carbon molecules moves away and converts to sugar, while the other three carbon molecules proceeds to the next stage. The three carbon molecules are converted into a five carbon molecule and the cycle begins again.