Earlier
Irrigation is invented in Mesopotamia.
The Akkadian Empire falls. Mesopotamia is ruled by
independent cities again.
The Akkadian Empire experiences a severe drought.
Sumerian cities start to grow.
Sargon of Akkad becomes a powerful king.
later

The main themes of the play are: fate and free will with the inevitability of oracular predictions is a theme that often occurs in greek tragedies the conflict between the individual and the state similar to that in sophocles’ “antigone” and   people’s willingness to ignore painful truths both oedipus and jocasta clutch at unlikely details in order to avoiding facing up to the inceasingly apparent truth and sight and blindness the irony that the blind seer tiresius can actually “see” more clearly than the supposedly clear-eyed oedipus, who is in reality blind to the truth about his origins and his inadvertent crimes.

The answer is:   [d]:   "a few spaces below the signature line" .