Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains \[{{H}^{+}}\] ions less than \[O{{H}^{-}}\] ions on this paper. She observed that the colour of paper turned yellow. What do you think was solution X?

• A.  Red litmus solution
• B.  Phenolphthalein
• C.  Methyl orange
• D.  Turmeric solution