Which of the following statements provides the best comparison between emerging global cities and struggling global cities?

a.

emerging global cities are growing rapidly, while struggling global cities are stagnant or declining.

b.

emerging global cities are located in democracies, while struggling global cities are located in communist countries.

c.

emerging global cities have a long history of development, while struggling global cities have come to the global stage only recently.

d.

emerging global cities are found in europe and north america, while struggling global cities are found in africa and south america.