Question

Archaeological evidence has shown that both rice and millet cultivation spread to the Korean Peninsula from China and that millet predates rice in Korea by a few thousand years because:
a) the Neolithic Koreans were at war with the people of the Yangzi River Valley
b) Neolithic Koreans preferred the taste of millet over rice
c) Korea is much colder than sub-tropical China where rice was first domesticated, thus rice had to be selectively adapted to grow in Korea
d) Korea is much warmer than the colder regions of China where rice was first domesticated, thus rice had to be selectively adapted to grow in Korea
e) Korea has few if any swamps and thus rice could not be grown there until sophisticated irrigation techniques were developed

Answer

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