"[The registrar] brought a big old book out there, and he gave me the sixteenth section of the constitution of Mississippi, . . . I could copy it like it was in the book, but after I got through copying it, he told me to give a reasonable interpretation and tell the meaning of the section I had copied. Well, I flunked out." Source: A History of the United States since 1861

A) The main intent of the literacy test described in the passage was to?
B) encourage reform of the political system
C) encourage Mississippi residents to learn about their state’s legal system
D) prevent African Americans from exercising a basic right
E) enforce the provisions of the United States Constitution