Which pair of events shows a cause-and-effect relationship!
A. Egyptians develop the square-rigged ship.
Large-scale irrigation projects begin.
B. Hyksos invade the Nile delta region.
Horse-drawn chariots come into use.
C. Queen Hatshepsut becomes pharaoh.
Amenhotep IV takes the throne.
D. Last native pharaoh rules.
Persia again conquers Egypt.