Answer
B.
Work Step by Step
ATP hydrolysis is very exergonic, which is what B. essentially says, allowing it to be coupled with endergonic reactions to make the overall reaction proceed spontaneously. C. is wrong because it is the opposite of this, and A. can be eliminated because ATP is not a catalyst but rather a reactant in these reactions. D. is untrue because the conversion of ATP to ADP is actually exergonic.
