The original question-specific evidence states: Chanhudaro is associated with the Indus region region. Indus region is the correct answer to “Which river or river-region is associated with Chanhudaro”. This evidence connects the required Ancient History fact with its archaeological, geographical, cultural or chronological setting. The choices Ghaggar-Saraswati region, Makran coast region and Karachi region do not satisfy the same combination of site, feature, river region, crop, craft, discovery, chronology or cultural association. Replaying that method confirms Indus region as the keyed response for this Ancient History question.