This question examines four geographical regions and their boundaries. China can be divided into four geographical regions: northern region, southern region, northwest region and Qinghai-Tibet region. "It is warm in winter, with no snow and no ice, and abundant precipitation all year round, which is very suitable for the growth of crops", indicating that this area is located in the south of Qinling-Huaihe River and is the southern region of China. So this question chooses option B.