Answer:c
Explanation: Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density. It is frequently applied to living organisms, most of the time to humans.
Urbanisation means that many new roads and buildings were build. It makes life easier for people. On the other hand it hurts nature, because you need to get rid of forests to build
The answer is B. phosphodioxide. It is not a pollutant of fossil fuels.