b
Titration curve for strong acid and weak base initially a buffer of weak base and conjugate acid is:

Formed, thus \({pH}\) falls slowly and after equivalence point, so the \({pH}\) falls sharply so methyl arrange, having \({pH}\) range of \(3.2\) to \(4.4\) will weak as indicator. So statement\(-I\) is correct.

Titration curve for weak acid and strong base \(({NaOH})\) Initially weak acid will form a buffer so \({pH}\) increases slowly but after equivalence point. it rises sharply covering range of phenolphthalein so it will be suitable indicator so statement\(-II\) is false.