Some people believe that saying that an organization is hierarchical says everything there is to say about how that organization operates.
All bureaucratically controlled organizations are hierarchical. Yet the Public Works Department, although bureaucratically controlled, operates quite differently than most other bureaucratically controlled organizations operate.
If the statements above are true, which one of the following must also be true on the basis of them?
(A) The Public Works Department operates
more like a nonbureaucratically controlled organization than like a bureaucratically controlled organization. - WRONG. We aren't sure in which manner the PWD works, whether bureaucratically or nonbureaucratically.
(B) Any organization that is hierarchical is bureaucratically controlled. - WRONG. Reverse of the highlighted text that can't be true always.
(C) From the fact that a given organization is hierarchical
nothing can reliably be concluded about how that organization operates. - WRONG. The word 'nothing' is a bit on extreme side as there's a probability that hierarchical organization might most likely be bureaucratically operated.
(D)
Not all hierarchical organizations operate in the same way. - CORRECT. This one leaves a scope of possibility in its claim, thus a good candidate. Even if it is only one that operates differently, it suggests 'not all' claim is true.
(E) Whether or not an organization is bureaucratically controlled
has nothing to do with how that organization operates. - WRONG. Somewhat contradicts the highlighted text.
C and E are good enough to trap people. Just see that the passage starts with 'some' which indicates that it is going to test the blurred line of probability of anything being true or false.
Answer D.