Question

what is urban sprawl?
spread of urban areas into rural regions
isolation of urban centers
concentration of cities

Explanation:

Urban sprawl is defined as the unrestricted growth of urban areas, typically into surrounding rural or undeveloped land. The first option, "spread of urban areas into rural regions", matches this definition. The second option (isolation of urban centers) and third option (concentration of cities) do not align with the concept of urban sprawl.

Answer:

A. spread of urban areas into rural regions