I love this question so subtle at wordplay.
my analysis -
A
WINS - "In large institutions whose divisions do not function autonomously, planning is not maximally realistic." - decentralisation always permits more realistic planning and strongly encourages innovation THAN centralised systems. always take note of comparative words here e.g., more realistic than WHAT? centralised system.
so if decentralised is more realistic than centralised ones then how come centralised systems be "MAX" realistic? in this case only decentralised ones can be "MAX" realistic among the two.
B - Innovation is not always encouraged in large centralized institutions. - argument only says that in DCT innovation is more "strongly encouraged" than CT but we cannot say that in CT Innovation is not "always encouraged" since it may be encouraged always but maybe not as "strongly" as DCT
C - For large institutions the advantages of decentralization outweigh its disadvantages - argument talks only about 2,3 aspects - innovation, planning, focus on institution-wide issues but we do not "other" relevant aspects so cannot infer this.
D - The central administrations of large institutions are usually partially responsible for most of the details of daily operations - arguments talks about DCT permits Central system to focus without being overwhelmed by the details of daily operations but this choice talks about "MOST" of the details of daily operations, from the argument we cannot infer that they are getting involved with "most" of the details or not. also "partially responsible" ? never mentioned anywhere
E - The people directly involved in implementing policies are always able to make innovative and realistic policy decisions - efficiency never mentioned anywhere