Urea reacts with water to form $A$ which will decompose to form $B$. $B$ when passed through $Cu^{2+}_{(aq)}$,a deep blue coloured solution $C$ is formed. What is the formula of $C$ from the following?
- A$CuCO_3 \cdot Cu(OH)_2$
- B$CuSO_4$
- C$[Cu(NH_3)_4]^{2+}$
- D$Cu(OH)_2$
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