The traditional architecture in the south of China is () A. Bunker B. Mongolian yurt C. Pit D. Diaojiaolou.

Many traditional residential buildings in China often adapt to the local natural environment. Most areas in the south belong to subtropical monsoon climate, with high temperature and abundant precipitation in summer, and the roof slope of the house is large, which is convenient for drainage. Most people live in bamboo buildings (diaojiao buildings), which are both heat-insulating and convenient for rainwater drainage. So option d fits the question.

Therefore, choose: d.