Multiple choice The mature phase of the Harappan civilization 3000 to 2500 BC 2000 to 1 BC 1 to 300 BC 2600 to 1900 BCE Reveal answer Fill a bubble to check yourself D Correct answer Explanation The mature phase of the Indus Valley (Harappan) Civilization is generally dated by archaeologists to between 2600 BCE and 1900 BCE.