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Which of the following is a reduction half-reaction?
A. 2 space HCI space plus space Ba open parentheses OH close parentheses subscript 2 space rightwards arrow space 2 space H subscript 2 O space plus space BaCI subscript 2
B. CI subscript 2 space plus space 2 e to the power of minus space rightwards arrow space 2 space CI to the power of minus
C. 2 space H subscript 2 space plus space O subscript 2 space rightwards arrow space 2 space H subscript 2O
D. Zn space rightwards arrow space Zn to the power of 2 plus end exponent space plus space 2 space e to the power of minus