Since the Spring and Autumn Period and the Warring States Period, the main farming methods of Chinese traditional agriculture are () A. slash and burn B. stone hoe C. iron.

Test and analysis: During the Spring and Autumn Period and the Warring States Period, people began to use iron farm tools and Niu Geng, and gradually popularized them. After the Han Dynasty, Niu Geng with iron plough became the main farming method of Chinese traditional agriculture. So choose C.

Comments: The farming methods of ancient agriculture in China mainly include:

(1) "slash and burn"-the main farming method of primitive agriculture;

(2) "Stone hoe plowing"-the appearance and widespread use of thunder;

(3) "Iron Plow Niu Geng"-intensive traditional agriculture.