In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO4 solution. If the volume of KMnO4 solution required to reach end point is 10 mL, the strength of the KMnO4 solution is

1. A. 0.10 M
2. B. 0.20 M
3. C. 0.25 M
4. D. 0.15 M

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