Urbanization: A. is growing more quickly in developing countries than in developed countries. B. currently accounts for housing about 75% of the global population. C. results in fewer employment opportunities in developed countries as compared to rural areas. D. refers to the migration of city people to the country to enjoy country living. E. describes a grouping of 10,000 or more individuals

A. is growing more quickly in developing countries than in developed countries.

Explanation:

the answer to your question is,

old stone age.

-mabel < 3

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."