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【单选题】
在制作印刷电路板的过程中常利用FeCl 3 溶液与Cu反应，其反应方程式为：2FeCl 3 +Cu═2FeCl 2 +CuCl 2 ．现向FeCl 3 溶液中加入a g Cu粉，完全溶解后，再加入b g Fe粉，充分反应后c g残余固体．若c＜a，则下列说法正确的是（ ）A.
残余固体全部是Cu
B.
残余固体可能为Fe和Cu的混合物
C.
最后得到的溶液可能含有Fe 3+
D.
残余固体是Fe，溶液中一定不含Cu 2+
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