The 1915 U

The 1915 U.S.Supreme Court case of Guinn v.United States declared that

A) grandfather clauses violated the Fifteenth Amendment.
B) black veterans of the First World War could not be denied the right to vote.
C) poll taxes imposed an "unconscionable" burden on citizens,and were therefore unconstitutional.
D) individuals could only lose the right to vote as a consequence of their own actions and not as a consequence of any ethnic,racial,or political group to which they belonged.