Ancient History question: The Harappans are regarded as among the earliest producers of:

The original question-specific evidence states: One of the earliest evidences of cotton cultivation comes from the Harappan Civilization. Cotton is the correct answer to “The Harappans are regarded as among the earliest producers of:”. This evidence connects the required Ancient History fact with its archaeological, geographical, cultural or chronological setting. Harappan evidence must be interpreted from excavated settlements, artefacts, environmental data and comparisons among sites; a single object should not automatically support a wider claim than the evidence permits. The choices Barley, Iron tools and Coins do not satisfy the same combination of site, feature, river region, crop, craft, discovery, chronology or cultural association. Replaying that method confirms Cotton as the keyed response for this Ancient History question.