In the qualitative analysis of group 3 cations blood red colouration is a test for

• As part of the qualitative study of group 3 cations, a test for analyzing qualitatively in chemistry entails figuring out a sample's chemical make-up. 
• It includes a variety of analytical chemistry methods that offer non-numerical data about a sample.
• ${\mathrm{Fe}}^{3+}$ provides thiocyanate ion with a blood-red colour.

Consequently, the right response is C) iron using thiocyanide as ligand.