Statement I:  Certain water soluble organic compounds like phenolphthalein and bromothymol blue behave as weak acids and exhibit different colours in their acid (HIn) and conjugate base $\left({\mathrm{In}}^{-}\right)$ forms.

Statement II :

• A

  Both statements I and II are correct.

• B

  Statement I is correct and statement II is incorrect.

• C

  Statement I is incorrect and statement II is correct.

• D

  Both statements I and II are incorrect.