Why did the first inhabitants of mainland Southeast Asia settle in plains and river valleys?(1 point)

Responses

Those areas were easy to defend.
Those areas were easy to defend.

Those areas were good for farming.
Those areas were good for farming.

Those areas were best for trade.
Those areas were best for trade.

D. Those areas were close to towns

None of the provided options accurately explain why the first inhabitants of mainland Southeast Asia settled in plains and river valleys. One possible reason could be that these areas provided fertile land for agriculture and access to water resources for irrigation.