A student carries out paper chromatography to work out which food dyes are present in a coloured sweet, S. Four known food dyes, W, X, Y, and Z, are used, with ethanol as the solvent. The chromatogram obtained is shown. Which of the statements are correct?
- A1, 2 and 4 only
- B2 and 3 only
- C2 and 4 only
- D4 only