Which of the given chemical equations is NOT balanced?

• A. \[3Fe+4{{H}_{2}}O\to F{{e}_{3}}{{O}_{4}}+4{{H}_{2}}\]
• B. \[KCl{{O}_{3}}\to KCl+{{O}_{2}}\]
• C. Candle 
• D. \[Mg+2HCl\,\to \,MgC{{l}_{2}}+{{H}_{2}}\]