For the answer to the question above, 
I am going to assume that MnO2 is a catalyst most likely breakdown of H2O2 
H2O2----MnO2------> H2O + 1/2 O2 
in that case, B) is answered in the trump suit 
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edit: I need to have a plate account to see - which I don't 
is it something like 
2H2O2 ---------------> 2H2O + O2 
...............MnO2 
where MnO2 is underneath the arrow, in that case, it means it is a catalyst and production will DRASTICALLY decrease in production