The correct option is A Magnesium and phosphate
The best-defined function of manganese is in the splitting of water to liberate oxygen during photosynthesis. Phosphorus is a constituent of cell membranes, certain proteins, all nucleic acids and nucleotides, and is required for all phosphorylation reactions.
Magnesium is an essential participant which plays a vital role in the reactions that generate and use ATP and phosphate will be required for the phosphorylation reactions.
ATP (adenosine triphosphate) must bind to a magnesium ion in order to be biologically active.
Hence, option D is correct.