According Carl Sauer, why did vegetative planting first start in Southeast Asia?
A) The predictable annual flooding of rivers provided needed irrigation.
B) The humid continental climate was ideal for experimentation.
C) The extensive river valleys provided excellent soil for cultivation.
D) The monsoon weather system was ideal for experimentation with plants.
E) The region's high biodiversity allowed people to become more sedentary, which naturally led to experimentation with plants.
Answer: E
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