Question

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.

Explanation:

After the Fifteenth Amendment (which granted African American men the right to vote), states used poll taxes (requiring payment to vote, which many African Americans could not afford) and literacy tests (often administered unfairly to disenfranchise African Americans) to limit their voting rights. Registration quotas weren't a primary method, state constitutions alone didn't target this, and blood tests/genealogy were not used for voting restrictions.

Answer:

C. poll taxes and literacy tests.