Answer:
Of the three Enforcement Acts, the Enforcement Act of 1870 was the first that was passed by the United States Congress from 1870 to 1871 during the Reconstruction Era to counter attacks on the suffrage rights of African Americans from the violent groups like the Ku Klux Klan.
The Enforcement Act of 1870 forbids discrimination by state officials in voter registration based on race, color, or previous condition of servitude. Penalties are established for preventing a person's right to vote and grant the federal courts the power to enforce the act.
Thus, the answer to this item is definitely the first and the second option:
>to protect voters from threats during elections
>to protect the rights of white Southerners to prosecute members of the Ku Klux Klan
Explanation: