The author states that in a "kindlier version” of multiculturalism, minorities discover "that they can play a part in molding the larger culture even as they are molded by it.” If no new ethnic groups were incorporated into the American culture for many centuries to come, which one of the following would be the most probable outcome of this "kindlier version”?
At some point in the future, there would be only one culture with no observable ethnic differences.
This application question clearly goes well beyond the passage. If no new ethnic groups were incorporated into the American culture, then the interplay between the larger and smaller groups would continue, with both groups changing, until there would be only one common (and different from any original) group.
Answer (c) is a very close answer option. But the question talks about what will happen after many centuries. Option (c) states what is happening now. After many centuries we will expect things to change and not stay the way they are (as stated in the passage).