Assertion: `Ce^(4+)` is used as an oxidising agent in volumetric analysis.
Reason: `Ce^(4+)` has the tendency to attain `+3` oxidation state.
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 not correct explanation for assertion.
C. If assertion is correct but reason is incorrect.
D. If both assertion and reason are incorrect.
