If a city has high density and most people live in informal settlements, what will be a planning priority?

Correct answer: Improving safe housing, sanitation and services

Direct answer: Option D. High density combined with informal housing can mean that many people share limited space without secure shelter, sanitation, drainage, clean water or reliable public services. Planning should therefore focus on safer housing and on improving essential services, while considering residents’ needs and access to livelihoods. Better data and participation can support this work, but simply deleting the density figure does not solve any problem. Option A is wrong because removing information hides the situation instead of improving it. Option B is wrong because ignoring informal settlements leaves the most affected residents without support. Option C is mathematically meaningless and would make density impossible to calculate. Option D addresses health, safety and living conditions directly. A useful warning is that density is only a number; planning must also examine housing quality and service access before judging people or places.