The correct option is C The enzymes required for carbon fixation are located only in the grana of chloroplasts
The carbon dioxide fixation that takes place during the light independent phase (Dark reaction) of photosynthesis occurs in the stroma of chloroplasts,as it has all the essential enzymes for fixation of carbon dioxide and synthesis of sugar.
The light dependent reaction of photosynthesis is the process that takes place in the grana of chloroplasts. Hence the third statement is incorrect.
All of the rest of the statements are correct. Hence, the answer is C.