The correct answer is B. Rural areas
Step-by-step explanation:
High population densities, as well as high housing prices, are mainly found in cities or nearby areas as most jobs and industries are located in these areas. This increases not only the number of people that live in these zones but also the price of housing as the prices of properties are higher due to a higher demand. This means, zones such as inner-city neighborhoods, suburbs, and similar are highly populated and the house prices are high.
On the other hand, nowadays rural areas have a small population density because most people are not interested in living in rural areas as it would take more time to get to cities where jobs and major industries are. Similarly, the housing prices are lower because the demand or number of people interested in buying properties is lower, which makes general housing prices lower.