Here's a problem to solve: Which equation is a balanced chemical equation?

Among the 4 following options, which is the correct answer?

- A: 2NaOH + CaBr_{2} -> Ca(OH)_{2} + NaBr
 
- B: NO + Cl_{2} -> NOCl
 
- C: CaCO_{3} -> CaO + 2CO_{2}
 
- D: 2AlCl_{3} + 3Mg -> 3MgCl_{2} + 2Al
 