38. Sodium fusion extract, obtained from aniline, on treatment with iron(II) sulphate and $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ in presence of air gives a Prussian blue precipitate. The blue colour is due to the formation of\\
(A) $\mathrm { Fe } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] _ { 3 }$\\
(B) $\mathrm { Fe } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] _ { 2 }$\\
(C) $\mathrm { Fe } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] _ { 2 }$\\
(D) $\mathrm { Fe } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] _ { 3 }$
Answer\\
(A)\\
(B)\\
(C)\\
(D)\\