Why do we not have more information about the Indus Valley civilization?
A.
Most archaeologists and historians prefer to work on the Mesopotamian and Egyptian civilizations.
B.
Only one ancient city in the Indus Valley has been discovered and explored.
C.
Archaeologists and historians have been unable to decipher any of the Indus Valley writing.
D.
The ancient peoples of the Indus Valley purposely obscured evidence of their existence.