In Lassaigne’s extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with `Fe^(3+)` due to the formation of -

Options

A. `NaSCN`
B. `[Fe(CN)_5NOS]^(4-)`
C. `[Fe(SCN)]^(2+)`
D. `Fe_4[Fe(CN)_6]_3. xH_2O`