The introduction of a tax-supported school system
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I believe the answer is D. Hope this helped!
Answer:World War I or the First World War, often abbreviated as WWI or WW1, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. World War II, also called Second World War, conflict that involved virtually every part of the world during the years 1939–45.
Explanation:
The eastern and western deserts prevented invaders from the east and west. The deserts were a hard climate to travel through. Therefore, nobody could walk across to conquer Egypt. Furthermore, the cataracts in the Nile to the south protected the Egyptians from lands below them. So the answer would be that The Nile protected the Egyptians from invasion.