What is the value of x in the following equation? MnO- 4 + 4H+ + xe- → MnO 2 + 2H2O

What is the value of x in the following equation? MnO- 4 + 4H+ + xe- → MnO 2 + 2H2O
A 2
B 3
C 4
D 7

Answer is B

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