I believe it would be D the power to veto laws. If it's wrong I'm sorry...
Answer: The staffs are resistant to STRUCTURAL CHANGE.
Explanation: Change can take one of four forms which are:
-Technological change.
-Structural change.
-Task change.
-People change.
Structural change is a kind of change which can affect the entire structure of an organization. In most cases it's needs to be done with care to avoid ripple effect on other arms of the firm.
Slaves worked not as hard, ran away, rebelled against their masters, did not do what they were supposed to, etc.
Because the mind is 'unobservable'
The reconquista is the same thing as the crusades, just in the Iberian peninsula (Spain Portugal) Catholics led a fight take back Spain from the Muslims and won, afterwards Catholics started to persecute any non-Christians