9.化學反應依其特性可進行分類,下列何者屬於置換反應?
(A)2Na(s)+2H2O(l)→2NaOH(aq)+H2(g)
(B)2H2O2(aq)→2H2O_{(l)+O2(g)
(C)N2(g)+3H2(g)→2NH3(g)
(D)AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)}