Bureaucratic mechanisms are engineered to resist change.
Conclusion (thus)
It's unlikely that bureaucracies will be simplified.
Evidence
Bureaucratic mechanisms are engineered to resist change.
Evidence
Pretty short and sweet. We just have, "Premise. Thus, [despite Concession], Conclusion."
Goal
They're asking us about the first claim, which is the one premise offered for the conclusion that "it's unlikely that bureaucracies will be simplified".