4. Which of the following equations is
balanced?
A. Cl2 + NaBr-> Br2 + NaCl
B. 2Cl2 + NaBr-> 2Br2 + NaCl
C. Cl2 + NaBr --> Br2 + 2NaCl
D. 2Cl2 + 2NaBr--> Br2 + NaCl2
E. Cl2 + 2NaBr-> Br2 + 2NaCl.