'V' is a roman numeral for '5', and I is also a roman numeral for '1'. If we add these together we'd have '6'. Therefore the '6th amendment.' The 6th amendment gives the citizens a right to a fair and speedy trial, an attorney appointed if cannot afford one, and the chance to confront the witnesses of accusement. The overview of Gideon's case was when he was in need for a defense attorney because he couldn't afford one.
Therefore the answer would be B