Read the following list, which shows some examples of Jim Crow laws, and answer the question below.
• Florida prohibited marriage between certain groups of people.
• Alabama required railroad stations to have separate waiting rooms for African Americans.
• Oklahoma required that African Americans pass a literacy test before being allowed to vote.
• Mississippi required racially segregated public schools.
–Source: U.S. National Parks Service
Based on this list, which state was in direct violation of the Fifteenth Amendment?
A. Alabama
B. Florida
C. Mississippi
D. Oklahoma