Sustainable development and land use planning are most concerned with
a. reducing pollution in large cities
b. improving long-term city 6
c. increased use of automobiles
d. economic stability

I chose letter b.  When you plan for long-term sustainability, you want to make sure that everything would last for a long time.  These plans would make improvements that people can sustain in the long run that would benefit the inhabitants.

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."

the correct answer is d