A student is asked to balance an equation by using the half-reaction method. He determines the two half reactions as shown below. 2Br⁻→ Br₂+2e⁻ Cl₂+2e⁻→ 2Cl⁻ What should he write as the final, balanced equation?
A. Cl₂+2Br⁻→ Br₂+2Cl⁻
B. Cl₂+2Br⁻+2e⁻→ Br₂+2Cl⁻
C. Cl₂+2Br⁻→ Br₂+2Cl⁻+2e⁻
D. Cl₂+Br⁻+2e⁻→ Br₂+Cl⁻+2e⁻