Ishaan tested the nature of a few common substances with different indicators and recorded his observations as follows :
Substance P turned methyl orange yellow.
Substance Q turned phenolphthalein colourless.
Substance R did not have any effect on blue or red litmus.
Substance S turned China rose indicator green.
P, Q, R and S could be respectively
A Lemon juice, fermented milk, salt solution and milk of magnesia.
B Sugar solution, vinegar, water and curd.
C Lime water, apple juice, sugar solution and saliva
D None of these.