Centrally planned economies can work effectively toward explicitly stated goals

The complete question is as follows:

Centrally planned economies can work effectively toward explicitly stated goals, but which of the following is?one disadvantage of such system? 

A.its performance almost always falls short of its ideals 
B. these economies never produce an increase in output 
C.the workers control all the production factors 
D. it gives too many rewards for innovation

I think the correct answer is option A. Its performance almost always falls short of its ideals is one disadvantage of it. Hope this answers the question. Have a nice day.