Which of the following statements regarding urbanization trends is true:
a. as of 2008, one third of the worl'd population lives in urban areas
b. most urban growth in the world is occurring in developing countries
c. cities in developing nations tend to have more females while cities in highly developed countries often have a higher ratio of males to females
d. urbanization in developed countries is increasing more rapidly than in developing countries
e. both a and b
Answer: b