Question

which statement best supports the fact that the united states is becoming more diverse?
quotas restricting immigration from certain parts of the world have been removed, but there are still limits on immigration.
by 2050, more than half the population of the united states will belong to an ethnic minority group.
between 2007 and 2009, the number of illegal immigrants in the united states dropped from nearly 12 million to less than 11 million.
more people in the united states are of latin american ancestry than of asian ancestry.

Explanation:

Diversity in a population context means having a variety of different ethnic, racial, cultural, etc. groups. A statement indicating a shift towards a majority - minority situation (where more than half the population is from ethnic minority groups) directly shows an increase in diversity. Quotas with remaining limits don't strongly show increased diversity. A drop in illegal immigrants doesn't relate to diversity. Comparing Latin American and Asian ancestries (without showing an overall increase in the number of different groups) doesn't best show increased diversity.

Answer:

By 2050, more than half the population of the United States will belong to an ethnic minority group.