Which of the following processes could theoretically produce the maximun mass of oxygen per gram of metal salt reactant?
A. NaBrO2 --->NaBr + O2
B. 2HgO ---> 2Hg + O2
C. 4KO2 + 2CO2 ---> 2K2CO3 +3O2
D. 2Na2O2 + 2H2SO4 ---> 2H2O + O2
E. 2KClO3 ---> 2KCl + 3O2