What biological process converts organic carbon compounds (like glucose) into inorganic compounds (like carbon dioxide)? a.) cellular respiration b.) photosynthesis c.) fossilization d.) combustion

I wanna say it is C.) fossilization 

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem