Which of these reactions can be classified as double replacement reactions?
A) Zn + 2HCl → ZnCl2 + H2
B) 2NaCl + F2 → 2NaF + Cl2
C) 2AlBr3 + 3K2SO4 → 6KBr + Al2 (SO4) 3
D) 2K + MgBr2 → 2KBr + Mg
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