Which of the following statements best explains why cities are so densely populated? a. cities have good airports for traveling. b. farms are the most densely populated areas of the country. c. cities have fewer government officials and less police protection than other regions. d. cities offer a wealth of opportunities for citizens, including jobs, access, education, and healthcare.

The fourth alternative is correct (D).

The cities became populous from the industrialization that took place in the nineteenth and twentieth centuries, when several jobs emerged and there was migration from the countryside to the city.

Currently the countryside is less populated and has the main function of guaranteeing the production of food that sustains the cities.

Cities, on the other hand, are the places where education,health, culture and employment opportunities have developed, concentrating the majority of the population.