Assertion (A): `pH` of water increases with an increase in temperature.
Reason (R) : `K_(w)` or water increases with increase in temperature.
A. if both assertion and reason are correct and reason is correct explanation for assertion.
B. if both assertion and reason are correct but reason is not correct explanation for assertion.
C. if assertion is correct but reason is incorrect.
D. if assertion and reason boht are incorrect.