The correct option is A IIIIIIIVA, DEBC
Potassium (K) - Key role in stomatal movement and transpiration and are most free ion.
Molypdenum (Mo) - Role as prosthetic group of nitrate reductase and nitrogenase in nitrogen metabolism.
Phosphorous (P) - Very important in RNA, DNA (heredity), in phospholipid (cell membrane), NADP (co-enzyme), ATP (energy reactions).
Manganese (Mn) - Essential for O2 evolution and photolysis of water in light reaction.