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The United States is a country composed of many different nationalities and foreign immigrants. ...

A

The United States is a country composed of many different races, and the immigrant population constitutes the main population of the United States. The first space is composed of "you" as an attribute, because "you" is an intransitive verb phrase, without passivity, or "you" as an attribute, because "you" is a transitive verb phrase, "passive" is composed of "you", and the past participle is used as an attribute. The second space is the compound structure with, because foreign immigrants and make up refer to the active relationship, so choose A.