How Did Egypt Benefit from Its Geographic Location

How did Egypt benefit from its geographic location?

A) Egypt's mild summer temperatures provided a long growing season.
B) Egypt enjoyed abundant rainfall, removing the need for an extensive irrigation system like that which consumed so many resources in Mesopotamia.
C) Egypt's extensive coastline along the Mediterranean and its many natural harbors led to an explosion in trade and commercial activity that made the Egyptian pharaohs among the wealthiest rulers in the Near East.
D) Egypt's Nile River flooded annually, depositing a rich layer of topsoil ideal for growing, and the wide swaths of desert to the east and west protected Egypt against outside invasion.