With decentralization, the power is distributed among many people instead of vested in one emperor. This means that each person will have less power overall. In addition, each individual will then try and gain power of their own over each other, weaking the original emperor's influence even more. Hope this helps!
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The Imperial rule has a high cost of paying for a military occupation same from local colonial taxes. This best explains the typical economic cost of imperial rule, meaning your answer is option A.
Hope this helps.
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To change the historical changes in thought & belief, to changes in social & institutional organization, that unfolded in Europe between roughly 1550-1700; beginning with Nicholas Copernicus (1473-1543), who asserted a heliocentric (sun-centered) cosmos, it ended with Isaac Newton (1642-1727), who proposed universal laws and a Mechanical Universe.