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.

The answer is "C"

The main reason why historians don't have a lot of information on this is because the people of the Indus river valley wrote in a language that historians today can't figure out what it means.

what are local authorities doing to fix the problem

explanation:

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.