In the redox reaction \(2 \mathrm{Fe}^{2+}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{Fe}^{3+}+2 \mathrm{Cl}^{-}\)

A. \(\mathrm{Cl}_{2}\) is reduced because it has lost electrons
B. \(\mathrm{Cl}_{2}\) is reduced because its oxidation number has decreased  
C. \(\mathrm{Fe}^{2+}\) is reduced because it has lost electrons
D. \(\mathrm{Fe}^{2+}\) is reduced because it has gained electrons

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Correct Answer: B