Answer :
It's either
D. Disease reduced the population.
or
E. Foreign conquerors forced the people to leave.
It was believed by some scholars that the Aryans conquered the people of the Indus Valley Civilization and forced them to leave (This explains the possible theory on why the Indus Valley Civilization declined for answer E)
D. Disease reduced the population.
or
E. Foreign conquerors forced the people to leave.
It was believed by some scholars that the Aryans conquered the people of the Indus Valley Civilization and forced them to leave (This explains the possible theory on why the Indus Valley Civilization declined for answer E)