Why do we group countries by regions?

Regional integration helps countries overcome divisions that impede the flow of goods, services, capital, people and ideas. These divisions are a constraint to economic growth, especially in developing countries.

Explanation:

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number 2 is your answer.

1. a

2. b

3. d

4. d

5. b

6. b

7.b

8. a

9. d

10. d