Final answer:
The enzyme found in the chloroplast stroma is RuBisCO, which is responsible for the carbon fixation stage of photosynthesis. Hence the correct answer is option A
Step-by-step explanation:
The enzyme that you would find in the chloroplast stroma is RuBisCO. RuBisCO is responsible for the carbon fixation stage of photosynthesis, where it catalyzes the reaction between CO2 and ribulose bisphosphate (RuBP). This results in the production of 3-phosphoglycerate (3-PGA), which is further converted into glucose.
Hence the correct answer is option A