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