Final answer:
The social class lines in the United States can be described as everything but c. favorable. There are three main classes: upper class, middle class, and lower class, and social mobility refers to the ability to move between these classes.
Step-by-step explanation:
The social class lines in the United States can be described as everything but c) favorable. In the United States, there are three main classes: upper class, middle class, and lower class.
Social mobility refers to the ability to move between these classes. However, class traits and behaviors can differ between classes.