12. When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? \[ \text{Na}_2\text{S}_2\text{O}_3 + \text{I}_2 \rightarrow \text{NaI} + \text{Na}_2\text{S}_4\text{O}_6 \]
(A) 1
(B) 2
(C) 3
(D) 4
(E) 6

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