Study the following lists

Answer

B

Explanation

Photolysis of water =Manganese, manganese activates many enzymes which further catalyze the reaction for photosynthesis
Diaz trophy = Molybdenum, all diazotrophs contains Iron-molybdenum
Cytochrome ‘c’ oxidase = Copper, copper ions function as one electron carrier
Biosynthesis of IAA = Zinc, zinc is required for the Synthesis of Auxin IAA and for carbohydrate metabolism.