Which of the following half reactions involves reduction?
A. 2H+(aq) + SO32-(aq) H2O(l) + SO2(g)
B. VO43-(aq) VO2+(aq)
C. CrO2-(aq) CrO42-(aq)
D. 2S2O72-(aq) + H2O(l) 2 SO42-(aq) + 2 H+(aq)
E. all the above
F. none of the above
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