A redox reaction occurs between chlorine and bromide ions. $\text{Cl}_2 + 2\text{Br}^- \rightarrow 2\text{Cl}^- + \text{Br}_2$ What is the change in oxidation state of the reducing agent in this reaction?
- A$-2$ to $0$
- B$-1$ to $0$
- C$0$ to $-1$
- D$0$ to $+1$