What are the reasons for the difference between the traditional dwellings in the south and the north

Answer C answer to the analysis of the test: the south of the low latitude, high temperature, high noon sun height, and more precipitation than the north; so the south of the wall is thin, A is wrong; residential roof slope, carp drainage, B is wrong; the south of the residential eaves wide, C is correct; the south of the southern residential positively south of the north of the position of the weak. Exam point: the difference between the southern and northern dwellings