Various factors have been suggested by Archaeologists for the decline of the Mature Harappan civilisation. Which of the following reasons is correct in this context?

All of the above

Causes of the decay of Harappan Civilisation:

Environmental changes, such as climate shifts and river course alterations.
Natural disasters like floods, earthquakes, and droughts.
The decline in long-distance trade networks and economic prosperity.
Social and political instability and internal conflicts.
Resource depletion, including deforestation and soil degradation.
Disease outbreaks and epidemics.
Contested theory of an Aryan invasion from the northwest.