Smart-Growth Efforts Are Being Used with Great Benefit to Growing

Smart-growth efforts are being used with great benefit to growing communities.Which one of the following is a principle of smart-growth?

A) To allow higher density populations,all available spaces in a town should be used for housing.
B) Expanding suburbs should have physical boundaries that limit further spread.
C) Expanding towns should carefully segregate commercial and residential buildings.
D) Existing stores and light industry must move outside of the town to free up space for housing.