Secondary schooling was primary installed as a way for students to be exposed to deeper understanding on the lessons that have been taken during their primary education. It was also designed so that students will be able to determine for themselves which skills they are good at and which skills they can improve.
The answer is C, and the reason why is because the climate changed and since they where not used to that, that affected them, also rainfall and flooding started to shrink and that also contributed to the downfall of the Old Kingdom.
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