单选题 According to the passage, the original proponents of the Fourteenth Amendment were primarily concerned with ______.

A、 detailing the fights afforded by the principle of equal citizenship
B、 providing support in the Constitution for equal protection for all citizens of the United States
C、 overturning the Civil Rights Act of 1866
D、 asserting that the civil rights protected by the Constitution included nonracial discrimination as well as racial discrimination

【正确答案】 D

【答案解析】从第一段the framers' immediate objective was to provide a constitutional warrant for the Civil Rights Act可以看出最初的支持者认为Fourteenth Amendment是为了保障Civil Rights Act的实行，选项D符合。