Universal indicator paper becomes purple when it is placed in an aqueous solution of Z. Which row shows the colours of methyl orange and thymolphthalein when each is added separately to an aqueous solution of Z?
- Amethyl orange: yellow; thymolphthalein: blue
- Bmethyl orange: yellow; thymolphthalein: colourless
- Cmethyl orange: red; thymolphthalein: blue
- Dmethyl orange: red; thymolphthalein: colourless