While doing qualitative analysis in chemistry lab, Abhishek added yellow coloured potassium chromate solution into a test tube. He was surprised to see the colour of the solution changing immediately to orange. He realised that the test tube was not clean and contained a few drops of some liquid. Which of the following substances will be the most likely liquid to be present in the test tube before adding potassium chromate solution ? (A) Sodium hydrogen carbonate solution (B) Methyl orange solution (C) Sodium hydroxide solution (D) $ ext{HCl}$ solution