Enzo thought he had properly wrapped the T-bone steaks before he froze them. When he pulls them out of the freezer to thaw, he notes that one edge of the steaks has freezer burn. Which statement BEST describes what has happened?

A.
One edge has turned color because Enzo forgot to add salt.
B.
One edge is frozen solid because it was exposed to ice crystals.
C.
One edge had bacterial growth that led to its breakdown.
D.
One edge lost moisture while in the freezer, dehydrating the meat.