Question

Why did the first inhabitants of mainland Southeast Asia settle in the plains and River valleys?
Those areas were best for trade
Those areas was easy to defend
Those area were close to towns
Those areas were good for farming

Answer 1

The first inhabitants of mainland Southeast Asia settled in the plains and river valleys primarily because **those areas were good for farming**. River valleys provided fertile land and a reliable water source for agriculture, which was crucial for sustaining larger populations and developing settled communities. The availability of resources such as water and fertile soil made these regions conducive to the growth of crops, which in turn supported trade and the establishment of towns over time.