Exchanges were regulated by a precise system of weights, usually made of a stone called chert and generally cubical , with no markings. Thelower denominations of weights were binary (1, 2, 4, 8, 16, 32, etc. up to 12,800), while the higher denominations followed the decimal system. The smaller weights were probably used for weighing jewellery and beads. Metal scale-pans have also been found.

(A) Harappan exchanges were regulated by a precise system of weights:

• This statement is correct. Archaeological evidence from the Harappan civilization suggests the use of a well-regulated system of weights and measures, indicating a degree of precision in their economic and trade activities.

(B) Weights were made of chert:

• This statement is incorrect. Harappan weights were primarily made of materials like chert, steatite, and other local stones. They were not typically made of metal.

(E) Metal scale-pans were also used for weighing:

• This statement is correct. Harappans used metal scale-pans as part of their weighing systems, indicating a sophisticated approach to measuring and weighing goods.

    So, the correct option is [2].