Which of the Following Statements Istrue in Describing Agriculture in Southeast

Which of the following statements istrue in describing agriculture in Southeast Asia?

A) Much of the area depended on water storage tanks.
B) Lowland areas were involved in rice agriculture.
C) Highland societies practiced slash-and-burn methods of agriculture.
D) Exact boundaries were difficult to establish because of the movement of slash-and-burn farmers.
E) All of these choices.