The correct option is D Fe4[Fe(CN)6]3,K3[Fe(SCN)6]
FeCl3 reacts with potassium ferrocyanide to form
4FeCl3+3K4[Fe(CN)6]→Fe4[Fe(CN)6]3A,Purssianblue+12KCl
FeCl3 reacts with KSCN to form deep red colour complex of K3[Fe(SCN)6]
FeCl3+3KSCN→K3[Fe(SCN)6]B,deepredcolour+3KCl