Concept:Citizens who are of unsound mind are disqualified from voting.Solution:In elections, every Ghanaian citizen who is 18 years and above and of sound mind has the right to vote (Article 42 of the 1992 Constitution).People with physical disabilities, including visual impairment and deafness, have the right to vote.However, a person who is mentally challenged, meaning of unsound mind, does not have the right to vote.Answer:Option D (Mentally challenged)