Why do historians debate the end of Harappan civilisation?

A. कारण पूरी तरह निश्चित नहीं हैं / The causes are not fully certain

Step 1: Identify the concept: this is historical interpretation. Step 2: Factors like climate change, river shifts and economic changes are discussed but no single cause is certain. Step 3: Treat decline as a multi-causal process.

Step 1: अवधारणा पहचानें: यह historical interpretation है। Step 2: Climate change, river shifts और economic changes जैसे factors discuss किए जाते हैं पर एक single cause निश्चित नहीं। Step 3: Decline को multi-causal process मानें।