Following the passage of the Fifteenth Amendment, states attempted to limit voting rights of African Americans through registration quotas. state constitutions. poll taxes and literacy tests. blood tests and genealogy.

poll taxes and literacy tests.

Explanation:

The Fifteenth Amendment gave the African Americans the right to vote avoiding prejudice: "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude." But some states tried to prevent the African Americans from voting using poll taxes, literacy tests or requiring they prove to own property.

The correct answer on Edgen is:

(C.) poll taxes and literacy tests.

I took the test and this is the right answer.