D.
Because the author can show how characters change (A), but they need to show how the characters acted before the change (C). And B is just what explains the character.
Answer:
The world's urban population in the 1930s was about 20%, and by the 1970s, it had grown to about 35%.
Explanation:
This phenomenon is known as urbanization, and consists in the increasing of the proportion of people who live in cities vs the proportion of the people who live in the countryside.
This is relevant because throughout history, the vast majority of people lived in the countryside as farmers, but when the industrial revolution started in the late 18th century, industry, and later services, began to slowly replace agriculture as the main economic activity of the world, and people began to move to cities to work in industry first, and later on, in the services.
Self-determination was point 10 of Wilson's Fourteen Points. Wilson wanted to re-draw the frontiers of eastern Europe so that races ruled themselves. In some ways, self-determination was achieved.
