Which process is catalyzed by rubisco during the light-independent reactions of photosynthesis?

The correct is the carboxylation process.

Explanation:

Rubisco or ribulose-1,5-bisphosphate carboxylase/oxygenase is the major enzyme of the calvin cycle. It is responsible for the fixation of carbon dioxide in plants into energy-rich molecules by initiating the Calvin cycle. The chlorophyll captured solar light at the origin of the processes of photosynthesis. RuBP or rubisco catalyzes both carboxylation and oxidation of ribulose-1,5-bisphosphate.

Thus, the correct answer is the carboxylation process.

"d.) carbon dioxide and hydrogen sulfide"