Distribution of Population

D is correct. Attractive climate can encourage people to choose suburban locations, but rising wildfire risk may make some of those places less desirable. Concerns about safety, evacuation, and property loss can lead some households to prefer safer inner areas or suburbs with lower risk. Other households may still choose riskier areas, so this is a possible shift rather than a certain outcome.

Option A is correct. The workers live at the destination while their families remain in the villages of origin, so the household is split between two places. This arrangement can be associated with circular migration when workers return periodically, but the question does not establish how often they return.

Option A is correct. Universities can add graduates and expertise, while start-ups can create local jobs that help retain skilled people. These factors may increase the city’s local concentration of skilled residents. Weak international connections may, however, limit its ability to attract talent and business from abroad; they do not guarantee that graduates will leave.