Here are the answers to your questions:
Question 1
A) Which of the following explains urban hierarchy?
Answer: a way of ordering cities with the largest populations
Question 2
A) Which term best describes an area that performs services integral to the world economy?
Answer: a global city
Question 3
A) Which of the following best describes the downfall of Greek city-states?
Answer: prolonged war
Question 4
A) Which of the following influenced the reform of Medellin, Colombia?
Answer: public education and increased neighborhood connectivity