Paper chromatography is carried out in the same manner using three separate dye mixtures. Each mixture includes at least one of the dyes W, X, Y and Z. The $R_f$ values for the dyes in the three mixtures are given. Which conclusion is correct?
- ADye W is nearest the solvent front and is present only in mixture 1 and mixture 3.
- BDye X has travelled furthest up the chromatography paper.
- CDye Y is the only dye present in all three mixtures.
- DDye Z is nearest the solvent front and is found in only two of the mixtures.