The grandfather clause kept the African Americans from nominating candidates for office.
The grandfather clause or the legacy clause can be defined as the law that states that the old rules will apply in some existing situations while the new rules framed will apply in all future cases.
In the case of African Americans, they were denied to nominate the candidates for office. The clause further stated that the African Americans who enjoyed the right to vote prior to 1867, or their lineal descendants, would be exempt in the future from educational, property, or tax requirements for voting.
Therefore the correct option is D.
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