Answer : 1. "6000 BC"
Explanation :

Answer: A) 6000 BC Explanation: Settled agriculture was first seen in China around 6000 BC. The crops grown at this time were rice and millet.Beginning in about 618 BC with classical millet agriculture, China's development of farming over the course of its history has played a key role in supporting the growth of what is now the largest population in the world.