Some conservative groups have organized to campaign both for crackdowns on illegal immigration and for limits on legal immigration. This is because they are concerned about how the United States will be changed by nonwhite immigrants. This means that they are against

A. discrimination.

B. embodied identities.

C. passing.

D. pluralism.

Answer: D.

It means that they are against "pluralism".

Explanation:

Pluralism involves recognizing and accepting people with different views, cultural backgrounds and opinions from the main culture of a larger society. In such a pluralist society, people coexist and live together in peace.

The United States is an example of a pluralist society.

In this case, the conservative groups campaigning to reduce the number of people coming into the United States are against pluralism.