Final answer:
Rice is the most suitable crop for cultivation in southern China due to the region’s wet rice agricultural practices and the crop's high yield per acre.
Step-by-step explanation:
The most suitable crop for cultivation in southern China is rice. Southern China is characterized by its ample water supply, long growing season, and a tradition of wet rice agriculture. Thanks to the development of strains that are more resistant to disease and have shorter times to harvest, rice can be grown more effectively.
The capacity of rice to be cultivated without necessitating fallow periods, coupled with the technique of wet rice cultivation that makes efficient use of water to control weeds and help rice absorb nutrients more efficiently, means rice can be produced in larger quantities.
As history shows, wet rice agriculture plays a significant role in supporting dense populations because of its ability to produce more food per acre than other grains like wheat.