In which of the following compounds iron has lowest oxidation state �

1.	In which of the following compounds iron has lowest oxidation state [MNR 1984]
A.	\[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\]
B.	\[{{K}_{4}}Fe{{(CN)}_{6}}\]
C.	\[Fe{{(CO)}_{5}}\]
D.	\[F{{e}_{2}}O\]
E.	\[{{K}_{2}}Fe{{O}_{4}}\]
Answer» D. \[F{{e}_{2}}O\]

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