SETBACK
The correct answer from the question and its following options is C. Setback.
Setback refers to the distance by which a building or structure must be set back from the property lines or boundaries. It is a zoning regulation that determines how close to the property line a building can be constructed.
Setbacks are established to ensure safety, privacy, light, and air circulation for neighboring properties. They also contribute to the aesthetics and overall urban planning of an area by controlling the massing and spacing of buildings.
Setback requirements can vary based on local zoning ordinances and the type of property or district.
NBC (National Building Code) and zoning are related concepts but do not specifically dictate the distance buildings can be built from property lines, unlike setbacks.