The purpose of traditional residential renovation is

The characteristics of residential buildings in southern China are influenced by the local natural environment. Most of them belong to subtropical monsoon climate, with high temperature and abundant precipitation in summer. The roof of the building has a large slope, which is convenient for drainage. Double-deck elevated heat insulation is adopted to facilitate rainwater drainage. This shows that the southern folk houses are characterized by a large roof slope, which is convenient for rainwater drainage.

Therefore, choose: d.