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 correct answer is D. Cities offer a wealth of opportunities for citizens, incluiding jobs, access, education, and healthcare.

Explanation

Cities are complex settlements, where there are extensive transport systems, large buildings for residential, commercial, labor, among others, wide coverage of services such as health, education, communication, work, and public services, In addition, it has large amounts of population, unlike rural areas. Another of its main characteristics is that there is the presence of government and state institutions depending on their importance. Within a country you can find several cities, however, one of them is usually more important than the others and is the capital city of that country. Because of the advantages previously mentioned, it is common people go to the cities because in there there is greater access to jobs, education, and healthcare. So, the correct answer is D. Cities offer a wealth of opportunities for citizens, incluiding jobs, access, education, and healthcare.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.