Pioneer Farmers Settling the Grasslands of the American West Often

Pioneer farmers settling the grasslands of the American West often built houses of sod, while early settlers of the eastern forest built wooden structures like log cabins. This suggests that building materials

A) are strongly influenced by local resources.
B) are commonly imported over long distances because of local folk culture.
C) are chosen because of the diffusion of popular culture.
D) are a uniform feature of folk culture.
E) are elements of popular culture.