Which of the Following Is True of How the United

Which of the following is true of how the United States has generally dealt with new populations of immigrants?

A) The United States has always been accepting of immigrant groups, with equal rights given to naturalized citizens-hence the designation "melting pot."
B) Immigration discrimination problems are only a recent development, directed primarily at Mexican Americans and Arab Americans.
C) The United States has always been accepting of immigrant groups, with equal rights given to green card holders-hence the designation "melting pot."
D) Immigrant groups have faced discrimination throughout U.S. history, with discrimination centering on different groups over time.
E) Immigration is an issue that has primarily been taken up at the congressional level over time.