China's Population Had Soared by the End of the 1700s

China's population had soared by the end of the 1700s because of all of the following except

A) relative peace and stability had prevailed during the early years of Qing rule.
B) new crops had been introduced from the New World.
C) introduction of the development of faster growing Southeast Asian rice into China.
D) the political stability of China in the seventeenth and eighteenth centuries.
E) the central government's termination of legal abortions.