Which of these sentences gives the best description of the american identity

What are the sentence choices?

These are the sentences: america is a melting pot of people of diverse ethnicities who share the common american dream.  the american identity is often reflected in american literature, which shows the many different perspectives that exist in the united states.as the nation's identity has grown and changed over time, that growth and change is reflected in american literature.and the right answer is (america is a melting pot of people of diverse ethnicities who share the common american dream. )