which statement best explains the reason congress passed the fifteenth amendment?

to stop poll taxes from creating an economic barrier to voting in the south
to protect the ability of freedmen to participate in choosing a government through voting
to guarantee the right to vote for women
to guarantee equal protection under the law to freedmen

The statement that best explains the reason Congress passed the Fifteenth Amendment is: "to protect the ability of freedmen to participate in choosing a government through voting." This amendment was specifically aimed at granting African American men, who were formerly enslaved, the right to vote and ensuring their political inclusion.