Final answer:
C) Resonance stabilization. The three reasons that phosphoanhydride bonds are so exergonic are the high energy of electrons, repulsion between phosphate groups, and resonance stabilization.
Step-by-step explanation:
The three reasons that phosphoanhydride bonds are so exergonic are: high energy of electrons, repulsion between phosphate groups, and resonance stabilization.
Phosphoanhydride bonds, which are found in molecules like adenosine triphosphate (ATP), are considered high-energy bonds because they store a large amount of potential energy. This energy is released when the bond is broken and the phosphate group is hydrolyzed, resulting in the formation of adenosine diphosphate (ADP) and inorganic phosphate (Pi).
The high-energy of electrons in the phosphate group, the repulsion between phosphate groups due to their negative charges, and the resonance stabilization contribute to the exergonic nature of these bonds.