Answer:
Option A
Explanation:
$Zn_{2}[Fe(CN)_{6}], K_{3}[Co(NO_{2})_{6}) and [(NH_{4})_{3}As (Mo_{3}O_{10})_{4}]$ show colour due to d-d transition while BaCrO4 is coloured due to charge transfer phenomenon.
Further , accroding to spectrochemical series the strong ligand possessing complex has higher energy and hence lower wavelength. Therefore , complexes containing $NO_{2}.NH_{4}^{+}.O^{2-}$ etc. ligands show yellow colour while CN - forces the complex to impart white colour
Spectrochemical series
I- < Br- < S2- < SCN- <Cl-
<NO3 - < N3- <F- <OH-
< C2 O42- =H2O< NCS- < CH3 CN
<py <NH3 <en <bipy
< Phan <NO2 <PPh3 <CN- = CO