The correct option is A Phosphorus
A biologically useful form of energy is the Adenosine triphosphate or ATP. The ATP is biochemically a nucleotide. It is the phosphoric acid ester of a nucleoside called adenosine. The ATP is produced by a process of phosphorylation. Plants carry out the phosphorylation process in the presence of sunlight. This process is called photophosphorylation. Animal cells (and also plant cells during respiration) carry out phosphorylation during oxidation of food. This process is called oxidative phosphorylation. Hence, The correct answer is option B.