Why Was Agriculture More Productive in Egypt Than in Mesopotamia

Why was agriculture more productive in Egypt than in Mesopotamia?

A) The milder climate in Egypt permitted a longer growing season and higher crop yields.
B) The Mediterranean Sea provided cool breezes that reduced stress on growing crops.
C) The stronger authority of the Egyptian pharaohs permitted better organization of the agricultural labor force.
D) The annual flooding and retreat of the Nile renewed the soil with fertile mud each year.