If mno2 was not added to this reaction, what effect would that have on the production of h2o and o2?

For the answer to the question above, 
I am going to assume that MnO2 is a catalyst most likely breakdown of H2O2 

H2O2MnO2> 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

D. most models represent a real world object in a simpler way

Ithink it’s one of those things that you put the object on