I believe the answer is D: It revolves around the family unit.
Well it depends what they are in need of. They most commonly would want more land for their country to build and farm on. They may want land with fertile soil for farming. They may want the land because of it's geography, for example, for simple trade routes leading to and from the areas around north America (Canada, Mexico) etc.
Answer:
False
Explanation:
Luxembourg is a country with less than 1 million residents