The E° value for the Mn 3+ /Mn 2+ couple is more positive than that of Cr 3+ /Cr 2+ or Fe 3+ /Fe 2+ due to change of

1. A. d 5 to d 4 configuration
2. B. d 5 to d 2 configuration
3. C. d 4 to d 5 configuration
4. D. d 3 to d 5 configuration

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