From which one of the following factory sites were limestone and chert blades mass produced and sent to various Harappan settlements in Sindh?

The correct answer is A, Sukkur and Rohri Hills. The limestone hills around Sukkur and Rohri in Sindh contain rich beds of fine chert, a hard, flint-like stone. Excavations there have found hundreds of Harappan quarry and workshop sites, where long, sharp chert blades were struck in large numbers and sent to towns across Sindh, including Mohenjodaro. Harappan stone tools look strikingly uniform over a huge area, and these factory sites explain why: a few specialised centres supplied standard blades and weights to many settlements. Option B is wrong because Khetri in Rajasthan was the Harappans' main source of copper, not chert. Option C is wrong because the Chagai Hills in Baluchistan are linked with minerals and, much later, Pakistan's nuclear tests, not with Harappan blade making. Option D is wrong because the hills of Baluchistan supplied other materials and had their own farming cultures, but they were not the chert factories serving Sindh. Exam tip: chert from Sukkur-Rohri, copper from Khetri, lapis lazuli from Shortughai in Afghanistan.