Correct Answer:
A. Tigris and Euphrates
The Mesopotamian civilization, often referred to as the 'cradle of civilization,' is famously situated between the Tigris and Euphrates rivers. The name 'Mesopotamia' itself means 'land between two rivers' in Greek, highlighting the pivotal role these rivers played in the development of early urban centers, agriculture, and complex societies like Sumer, Akkad, Assyria, and Babylonia. The other options refer to river systems associated with different ancient civilizations: Nile (Egypt), Indus and Ganges (India), and Huang He and Yangtze (China).