trade

Rare stones such as lapis lazuli often had to be obtained from particular geological regions far from many settlements. Beads made from them therefore suggest the movement of raw materials, finished products, artisans, or traders across long distances. This is archaeological evidence for exchange networks and contact with distant regions, not direct evidence of rainfall, animal rearing, or grain production; hence B is correct.

When the geological source of stone lies far from the archaeological site, the material must have reached the community through movement, exchange, procurement, or travel. This is evidence of contact over distance, although it does not by itself prove a particular commercial system. Option B is correct. Local resources, urban decline, and script development are not established by the stone’s distant origin alone.