In which one of the following changes there are transfer of five electrons?
A. `MnO_(4)^(-) rarr Mn^(2+)`
B. `CrO_(4)^(2) rarr Cr^(3+)`
C. `MnO_(4)^(2-) rarr Mn^(2+)`
D. `Cr_(2)O_(7)^(2-) rarr 2Cr^(3+)`

In which one of the following changes there are transfer of five electrons?
A. `MnO_(4)^(-) to Mn^(2+)`
B. `CrO_(4)^(2-) to Cr^(3+)`
C. `MnO_(4)^(-) to MnO_(2)`
D. `Cr_(2)O_(7)^(2-) to 2Cr^(3+)`