Answer: b. drove a wedge between people who once were friendly.
Explanation: In the given excerpt from the song “Brother, Can You Spare a Dime?” we can see that it emphasizes the idea that the problems of the Great Depression drove a wedge between people who once were friendly, this is expressed in the excerpt because the speaker is talking about how the other person used to be his friend, and he and other people, use to call him "Al" and now it isn't like that.
The answer is C) cause and effect because if it explores the relationship between and action and it's consequences you would be talking about a cause and then it's effect of what happened.
