(A) The reaction of oxalic acid with acidified `KMnO_(4)` is first slow and then proceeds with faster speed. (R) Acidified `KMnO_(4)` is a strong oxidising agents.
A. If both (A) and (R) are true and (R) is the correct explanation of (A).
B. If both (A) and (R) are true but (R) is not the correct explanation of (A).
C. If (A) is correct but (R) is incorrect.
D. If (A) and (R) are both incorrect.