The best choice for describing how the Fifteenth Amendment was an effort to reconcile the discrepancy between American ideals and public policies is:
Congress passed a law that removed voting restrictions based on race.
This response aligns with the intention of the Fifteenth Amendment, which sought to ensure that race could not be used as a criterion for denying the right to vote, thus addressing the inequalities established in earlier state laws, such as those described in the Ohio State Constitution.