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The correct answer is option 1, Sukkur and Rohri Hills. The reasons for each option are explained below:
Option 1: Sukkur and Rohri Hills
These two sites, located in modern-day Pakistan, were known for the mass production of limestone and chert blades during the Harappan period. These blades were transported to various Harappan settlements in Sindh, making this the correct option.
Option 2: Khetri in Rajasthan
Although Khetri in Rajasthan is known for its rich mineral deposits, it was primarily associated with the production of copper, not stone blades.
Option 3: Chagai Hills
The Chagai Hills area, located in the Baluchistan region of modern-day Pakistan, was rich in stone resources. However, there is little evidence to suggest it was a significant production site for limestone and chert blades for the Harappan settlements in Sindh.
Option 4: Hills of Baluchistan
While the Hills of Baluchistan are known for being rich in mineral and stone resources, there is no strong evidence to suggest these hills were a major source of limestone and chert blades for the Harappan settlements in Sindh.