How does the reversible reaction of hydrofluoric acid in water illustrate the behavior of weak electrolytes?

• A. It shows that weak electrolytes completely dissociate, forming a static equilibrium.
• B. It shows that weak electrolytes form covalent bonds with water molecules.
• C. It shows that weak electrolytes do not dissociate at all, remaining as molecules.
• D. It shows that weak electrolytes partially dissociate, forming a dynamic equilibrium between ions and molecules.

Answer: (D)