What is the correct chronological order of four civilisations of Mesopotamia?
(a) Sumerians – Assyrians – Akkadians – Babylonians
(b) Babylonians – Sumerians – Assyrians – Akkadians
(c) Sumerians – Akkadians – Babylonians – Assyrians
(d) Babylonians – Assyrians – Akkadians – Sumerians
