The correct option is A Primary energy carrier
Adenosine triphosphate (ATP) is a primary energy carrying molecule found in the cells of all living organisms. ATP can store energy in the form of a high energy phosphate bond. The hydrolysis of ATP to ADP releases 7.3 kcal/mol of energy.
Catalysts accelerate chemical reactions and enzymes are biocatalysts that enhance the rate of a biochemical reaction in living cells.