Which one of the following is a double-displacement reaction?
~There can be more then one answer~
A. 2H2 (g) + O2 (g) → 2H2O (g)
B. 2H2O (l) → 2H2 (g) + O2 (g)
C. NaOH (aq) + HCl (aq) → NaCl (aq) + HOH (l)
D. Cu (s) + 2AgNO3 (aq) → Cu (NO3) 2 (aq) + 2Ag (s)
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