Primate cities are the focal point of a country's finance, commerce and population. Which of the following is TRUE regarding primate cities?

A.) Primate cities are almost always found in Less Developed Countries (LDCs)

B.) Transportation systems form a hub-and-spoke type system around the primate city.

C.) Primate cities are always located along ports ensuring economic dominance within the country.

D.) Primate cities can only occur in capitalistic countries because of freedom of markets.

E.) The population of the country will shift away from primate cities often times resulting in declining populations.

Please explain it!!