Which statement regarding ATP is false?

(A) ATP can act as a group donor in adenylylation reactions.
(B) Most enzymes that use ATP bind it in a form complexed with Mg2+.
(C) ATP concentrations in a cell are usually much higher than the equilibrium concentration for ATP hydrolysis.
(D) Compared with other phosphate‑containing compounds in biochemistry, ATP has a higher free energy than nearly all of the others.