What event most affected agricultural productivity in the Late Harappan?

Name: What event most affected agricultural productivity in the Late Harappan?
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The shifting courses of rivers, particularly the Indus and its tributaries, significantly impacted agricultural productivity in the Late Harappan period. This change disrupted the irrigation systems and agricultural patterns that the Harappan civilization depended on, leading to a decline in their urban centers.

What Event Most Affected Agricultural Productivity in the Late Harappan