PART A: What is the reality of upward mobility in the United States?

A$.$ People are more likely to achieve upward mobility in the United States than anywhere else in the world

B$.$ People who were born poor in the United States tend to remain poor until they die

C$.$ People who were born poor in the United States tend to have much more motivation to remedy their financial situation than in other countries

D$.$ People are no more likely to achieve upward mobility in the United States as they are in many other countries