Choose the correct statements regarding the dynamics and distribution of settlements:

A. Settlement types can transition from one form to another as the economic base and transportation networks of an area evolve.

B. Radial settlement patterns commonly emerge around significant economic resources, not necessarily geographical features.

C. The nucleated (clustered) form of settlement is conducive to efficient defense and communal social activities.

D. Dispersed settlement patterns are mainly found in regions with dense transportation networks and high population densities.