By the Turn of the Twentieth Century, the Population of the United

By the turn of the twentieth century, the population of the United States had shifted to three large racial and ethnic groups. These groups are:

A) Whites, Blacks, and Hispanics.
B) Asians, African-Americans, and Caucasians.
C) Asians, African-Americans, and Hispanics.
D) African-Americans, Native American Indians, and Caucasians.
E) Hispanics, Native-American Indians, and Caucasians.