It is believed that the indus civilization was very large because a. they built a sophisticated road system b. the valley is in both india and pakistan c. hundreds of miles separated major cities d. they constructed a widespread irrigation system

It is believed that the Indus civilization was very large because C: hundreds of miles separated major cities.The civilization was also known as Harappa civilization. The Indus civilization was located in what is now known as Pakistan. Their civilization was estimated to be four times bigger than that of England.

C. is the answer

Explanation:

C. hundreds of miles separated major

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