Anwser: B
Explanation: it just is
They created the earliest known writing system, know as cuniform.
In a unitary system of governenment, the local offices don't have much power. Instead, they rather follow the orders from the central government. So you could say that they are not independent, not even partially (like in feredal systems) and are therefore subject to the central government.
I believe the answer is: Wisdom
Wisdom influences our ability to use the knowledge that we have in order to make a good judgment.
As we got older, our brain's function will deteriorate. But, older people tend to accumulate more experience compared to the younger ones. Those experiences will provide older people with knowledge that might not be known by younger people. They could use it as a core strength to make better judgments than younger people.
