D.

Magnesium ions form a Mg-ATP complex that is the true substrate for many ATP-hydrolyzing enzymes, and classic studies show that ATPase activity (e.g., Na⁺/K⁺-ATPase, mitochondrial F₁-ATPase) is strictly Mg²⁺-dependent, while the other listed enzymes do not require Mg²⁺ as an essential cofactor [Jenkins, 1994, PMID 8053694; Vrbjar, 1985, PMID 3161751].