The Development of Wet Rice Farming Was Significant for China,especially

The development of wet rice farming was significant for China,especially because it

A) freed the Chinese from dependence on Vietnam for food.
B) gave them plenty of work for the Chinese peasantry.
C) provided a marketable product for exchange with the West.
D) provided an increased food supply that led to a large population increase without badly damaging the economy.
E) ensured that even during drought conditions in the western lands, the people there could still be fed.