What does high density refer to in geographical terms?

High density in geographical terms refers to a large number of buildings, people, or structures within a small area. This concept is often applied in urban geography, where cities tend to have a high population density due to limited space and a high concentration of amenities and services. For example, in metropolitan areas, high-rise apartments and commercial buildings are common, maximizing land use and accommodating many residents and businesses in compact spaces.

This makes answer A correct, as it accurately describes the relationship between the number of buildings and the area they occupy. High density can lead to vibrant urban environments but may also result in challenges such as congestion and limited green spaces, which are consequences of having too many entities in a confined area.