High density and high rent in an urban area show which relation?

Correct answer: Limited land supply and high demand

Direct answer: Option A is correct. Urban land is limited, especially near employment, transport, education and other important services. When many households and businesses want to use the same limited space, demand for land and housing becomes high. If supply cannot expand quickly, competition may raise rents. Therefore, high density combined with high rent can indicate strong demand for limited urban land, although rent can also be affected by location, building quality and services. Option B does not explain the relevant land-market relationship. Option C connects unrelated measures and cannot explain urban rent. Option D may describe social diversity, but the number of languages does not directly determine rent. The correct conclusion is about supply and demand, not an automatic claim that every dense area has the same rent. Memory cue: scarce space plus many users often means higher land demand.