Why did the first inhabitants of mainland Southeast Asia settle in the plains and river valleys
A. Those areas were best for trade
B. Those areas were easy to defend
C. Those areas were close to town
D. Those areas were good for farming
D. Those areas were good for farming
The first inhabitants of mainland Southeast Asia settled in the plains and river valleys because those areas were fertile and suitable for agriculture. The availability of water from the rivers allowed for irrigation, which helped in the cultivation of crops. This made farming easier and more productive in these regions compared to other areas.