If $Fe^{3+}$ and $Cr^{3+}$ both are present in group III of qualitative analysis, then distinction can be made by :

Question

( A ) addition of $NH_4OH$ in presence of $NH_4Cl$ when only $Fe(OH)_3$ is precipitated
( B ) addition of $NH_4OH$ in presence of $NH_4Cl$ when $Cr(OH)_3$ and $Fe(OH)_3$ both are precipitated and on adding $Br_2$ water and $NaOH, \; Cr(OH)_3$ dissolves
( C ) precipitate of $Cr(OH)_3$ and $Fe(OH)_3$ as obtained in (b) are treated with conc. HCl when only $Fe(OH)_3$ dissolves
( D ) none of these