Given: S₂O₄^2-(aq) $\rightarrow$ SO₃^2-(aq),basic Solution

Given: S₂O₄^2-(aq) $\rightarrow$ SO₃^2-(aq) ,basic solution. How many electrons appear in the balanced half-reaction?

A) 3
B) 6
C) 1
D) 4
E) 2